Driving method of display panel and display device

Abstract

This invention provides a driving method and display device for a display panel. A frame of the display panel includes at least one subframe, and the operation of the pixel circuit in the subframe includes at least a light-emitting phase. When displaying the same grayscale level, the brightness of the display panel in a first brightness mode is greater than its brightness in a second brightness mode. In each brightness mode, the light-emitting device is controlled to display grayscale levels according to a subframe instantaneous brightness allocation rule. The number of subframes included in a frame in the second brightness mode is no greater than the number of subframes included in a frame in the first brightness mode. The maximum duration of the light-emitting phase in a subframe in the first brightness mode is greater than the maximum duration of the light-emitting phase in a subframe in the second brightness mode. When driving the display panel to adjust from a high brightness mode to a low brightness mode, the instantaneous brightness of the light-emitting device is minimized, thereby ensuring that the light-emitting device operates within a high uniformity and high efficiency range.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a driving method and display device for a display panel. Background Technology

[0002] Micro-LED (Micro-light-emitting diode) features miniaturization, high photoelectric conversion efficiency, and short response time. Micro-LED is expected to become the next-generation display technology after OLED (Organic Light-Emitting Diode). Display panels typically have brightness adjustment functions to suit different application scenarios, such as using a high-brightness mode outdoors in bright light and a low-brightness mode indoors. However, using traditional brightness adjustment methods to adjust the brightness of Micro-LED display panels would affect its efficiency and uniformity. Summary of the Invention

[0003] This invention provides a driving method and display device for a display panel, so that the display panel has better efficiency and uniformity when adjusting brightness.

[0004] In a first aspect, embodiments of the present invention provide a driving method for a display panel. The display panel includes multiple light-emitting devices and multiple pixel circuits. A frame of the display panel includes at least one subframe, and the operation of the pixel circuits in the subframe includes at least a light-emitting stage. The display panel includes a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode. The driving method includes:

[0005] In the first brightness mode, one frame of the display panel includes N subframes, where N is an integer and N≥2; in the first brightness mode, the light-emitting device displays grayscale levels according to the instantaneous brightness allocation rules of the subframes.

[0006] The subframe instantaneous brightness allocation rules include: the gray level displayed by the light-emitting device increases as its instantaneous brightness in the subframe increases; after the light-emitting device reaches its maximum instantaneous brightness in the current subframe, it is allocated to emit light in the next subframe; and the duration of the light-emitting phase in the next subframe is not less than the duration of the light-emitting phase in the current subframe.

[0007] In the second brightness mode, one frame of the display panel includes M subframes, where M is an integer and N≥M≥1; in the second brightness mode, the light-emitting device displays grayscale levels according to the instantaneous brightness allocation rules of the subframes.

[0008] In the first brightness mode, the maximum duration of the light emission phase in N subframes is t10, which is greater than the maximum duration of the light emission phase in M ​​subframes in the second brightness mode.

[0009] Secondly, based on the same inventive concept, embodiments of the present invention also provide another driving method for a display panel, the display panel including multiple light-emitting devices and multiple pixel circuits; the pixel circuits include a first driving circuit and a second driving circuit, the first driving circuit being configured to control the duration of providing driving current to the light-emitting devices based on a first data voltage, and the second driving circuit being configured to control the amplitude of providing driving current to the light-emitting devices based on a second data voltage; the working process of the pixel circuits in one frame of the display panel includes a writing phase and a light-emitting phase;

[0010] The display panel includes a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode. The light-emitting device includes a first color light-emitting device. The driving method includes:

[0011] In the first brightness mode, when the first color light-emitting device displays the maximum gray level, the first data voltage written during the writing phase is PWM-data11, the second data voltage written is PAM-data1, and the effective light emission duration during the light emission phase is t31. In the first brightness mode, the light-emitting device displays gray levels according to gray level allocation rules. The gray level allocation rules include: the second data voltage written during the writing phase is fixed, and the gray level displayed by the light-emitting device changes with the change of the first data voltage.

[0012] In the second brightness mode, when the first color light-emitting device displays the maximum gray level, the first data voltage written during the writing phase is PWM-data21, the second data voltage written is PAM-data2, and the effective light-emitting duration during the light-emitting phase is t41; in the second brightness mode, the light-emitting device displays gray level according to the gray level allocation rules.

[0013] Where PWM-data21 ≠ PWM-data11, PAM-data2 = PAM-data1, t41 <t31。

[0014] Thirdly, based on the same inventive concept, the present invention provides another driving method for a display panel. The display panel includes multiple light-emitting devices and multiple pixel circuits. A frame of the display panel includes at least one subframe. The working process of the pixel circuit in the subframe includes at least a writing stage and a light-emitting stage.

[0015] The display panel includes a first mode, and the driving method includes:

[0016] In the first mode, the subframe includes a first subframe and a second subframe;

[0017] When the light-emitting device displays the first grayscale level: in the first subframe, the duration of the light-emitting phase is t1, and the data voltage of the write phase corresponding to the first subframe is V3; in the second subframe, the duration of the light-emitting phase is t2, and the data voltage of the write phase corresponding to the second subframe is V4; and t1≤t2; where,

[0018] ││V4│-│V3││≤0.2△V, where △V is the voltage difference between the maximum and minimum values ​​of the data voltage provided by the display panel;

[0019] Alternatively, the driving transistor in the pixel circuit is an n-type transistor, V3 < V4, or the driving transistor in the pixel circuit is a p-type transistor, V3 > V4.

[0020] Fourthly, based on the same inventive concept, embodiments of the present invention also provide a display device, including a display panel, wherein the display panel is driven by a driving method provided in any embodiment of the present invention.

[0021] The driving method and display device for the display panel provided in this embodiment of the invention have the following beneficial effects:

[0022] In some embodiments of the present invention, a frame of the display panel includes at least one subframe, and the display panel controls the display grayscale levels of the light-emitting devices according to the instantaneous brightness distribution rules of the subframes. When driving the display panel to switch from a high-brightness mode to a low-brightness mode, the overall brightness is reduced by first decreasing the light-emitting phase duration of the subframe with the longest light-emitting phase, and then by reducing the number of subframes in a frame. When a frame includes one subframe, the low-brightness display of the display panel is achieved by reducing the instantaneous brightness of the light-emitting devices. When driving the display panel to adjust from a high-brightness mode to a low-brightness mode, the instantaneous brightness of the light-emitting devices is minimized, thereby ensuring that the light-emitting devices operate in a high uniformity and high-efficiency range.

[0023] In other embodiments of the present invention, the pixel circuit in the display panel includes a pulse width modulation circuit and an amplitude modulation circuit. The pulse width modulation circuit controls the duration of the driving current supplied to the light-emitting device, and the amplitude modulation circuit controls the magnitude of the driving current supplied to the light-emitting device. The display panel controls the display of grayscale levels by the light-emitting device according to grayscale distribution rules. When driving the display panel to switch from a high-brightness mode to a low-brightness mode, the overall brightness is first reduced by adjusting the effective light-emitting duration of the light-emitting device, and then the low-brightness display is achieved by reducing the instantaneous brightness of the light-emitting device in the low-brightness mode. When driving the display panel to adjust from a high-brightness mode to a low-brightness mode, the instantaneous brightness of the light-emitting device is minimized, thereby ensuring that the light-emitting device operates in a high uniformity and high-efficiency range. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0026] Figure 2 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram illustrating the instantaneous brightness and grayscale level allocation of a subframe;

[0028] Figure 4 This is a comparative schematic diagram of the first brightness mode and the first sub-brightness mode in an embodiment of the present invention;

[0029] Figure 5 This is another comparative schematic diagram of the first brightness mode and the first sub-brightness mode in an embodiment of the present invention;

[0030] Figure 6 This is another comparative schematic diagram of the first brightness mode and the first sub-brightness mode in an embodiment of the present invention;

[0031] Figure 7 This is another comparative schematic diagram of the first brightness mode and the first sub-brightness mode in an embodiment of the present invention;

[0032] Figure 8 This is a timing comparison diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0033] Figure 9 This is another timing comparison diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0034] Figure 10 This is a comparative schematic diagram of the first brightness mode and the second sub-brightness mode in an embodiment of the present invention;

[0035] Figure 11 This is a comparative schematic diagram of the second sub-brightness mode and the third sub-brightness mode in an embodiment of the present invention;

[0036] Figure 12 This is a comparative schematic diagram of the second sub-brightness mode and the fourth sub-brightness mode in an embodiment of the present invention;

[0037] Figure 13This is a comparative schematic diagram of the fourth sub-brightness mode and the fifth sub-brightness mode in an embodiment of the present invention;

[0038] Figure 14 This is another timing comparison diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0039] Figure 15 This is another timing comparison diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0040] Figure 16 This is a schematic diagram of a driving method provided in an embodiment of the present invention;

[0041] Figure 17 This is a schematic diagram of a subframe state in a first mode provided by an embodiment of the present invention;

[0042] Figure 18 This is a schematic diagram of another subframe state in the first mode provided by an embodiment of the present invention;

[0043] Figure 19 This is a comparative diagram of the first sub-pattern and the second sub-pattern in an embodiment of the present invention;

[0044] Figure 20 This is another comparative diagram of the first sub-pattern and the second sub-pattern in an embodiment of the present invention;

[0045] Figure 21 This is another comparative diagram of the first sub-pattern and the second sub-pattern in an embodiment of the present invention;

[0046] Figure 22 This is another comparative diagram of the first sub-mode and the second mode in an embodiment of the present invention;

[0047] Figure 23 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0048] Figure 24 for Figure 23 A timing diagram of the pixel circuit provided in the embodiment;

[0049] Figure 25 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0050] Figure 26 This is another comparative diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0051] Figure 27 This is another comparative diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention;

[0052] Figure 28This is a comparative schematic diagram of three brightness modes in an embodiment of the present invention;

[0053] Figure 29 This is another comparative diagram of the three brightness modes in an embodiment of the present invention;

[0054] Figure 30 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0057] It should be understood that although the terms "first" and "second" may be used to describe XX in the embodiments of the present invention, these XX should not be limited to these terms. These terms are only used to distinguish XX from each other. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX.

[0058] Currently, the brightness adjustment scheme used in OLED display panels involves first reducing the instantaneous brightness of the OLED device when adjusting from a high-brightness mode to a low-brightness mode, and then reducing the emission time of the OLED device to further decrease the brightness. The instantaneous brightness is related to the driving current that powers the OLED device; a higher driving current and higher current density result in a higher instantaneous brightness. For Micro-LED display panels, Micro-LED devices exhibit better luminous efficiency and uniformity at high current densities, and reducing current density significantly impacts these aspects. If a traditional brightness adjustment scheme is used for a Micro-LED display panel, the current density must be reduced first when adjusting from a high-brightness mode to a low-brightness mode, which would affect the efficiency and uniformity of the display panel.

[0059] To meet the application requirements of Micro-LED display panels, this invention proposes a driving method for display panels, which can be used to adjust the brightness of the display panels. To facilitate understanding of the technical solution of this invention, some terms used in this application will first be explained.

[0060] Regarding brightness and grayscale: When displaying an image, the display panel as a whole has a certain brightness, and the light-emitting devices have a certain brightness according to the grayscale information they display. The display panel includes multiple brightness modes. In different brightness modes, the display panel has different brightness when displaying the same grayscale level. In each brightness mode, the light-emitting devices can achieve the display of 0-255 grayscale levels, or in other words, the light-emitting devices can display 256 brightness levels in each brightness mode. The grayscale levels of the display panel can also be other numbers; this application does not impose a specific limit on the number of brightness levels of the display panel.

[0061] For example, a display panel includes a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode. The display panel displays the same grayscale level in both brightness modes, meaning it displays the same image in both modes. When the display panel displays the same image in different brightness modes, the grayscale level displayed by a sub-pixel at a fixed position remains constant. In other words, by adjusting the brightness adjustment module of the display panel (e.g., dragging the brightness bar), different brightness modes can be achieved when controlling the display panel to display the same image.

[0062] Regarding frames and subframes: A frame is a picture displayed on the display panel, and a frame can include subframes. A subframe includes at least a writing phase and a light-emitting phase. The display panel includes multiple scan lines and multiple light-emitting control lines. One scan line connects multiple subpixels, and one light-emitting control line connects multiple subpixels. The scan lines and light-emitting control lines drive the subpixels simultaneously; the scan lines control the writing phase, and the light-emitting control lines control the light-emitting phase. In a subframe, the multiple scan lines of the display panel output enable signals sequentially from top to bottom, and the multiple light-emitting control lines output enable signals sequentially from top to bottom. When a frame includes two or more subframes, in each subframe, the multiple scan lines of the display panel output enable signals sequentially from top to bottom, and the multiple light-emitting control lines output enable signals sequentially from top to bottom. For example, when there are two subframes, for a light-emitting device, the sum of its brightness in the two subframes is the grayscale level required to be displayed in one picture. Therefore, the images displayed by the display panel in the two subframes are superimposed to form a complete picture to be displayed. A frame can also consist of only one subframe. In this case, the difference between a frame and a subframe is only in name. In a subframe, multiple scan lines output enable signals from top to bottom to complete the display of a complete image.

[0063] In some embodiments of the present invention, a frame of the display panel includes at least one subframe, and the display panel controls the display grayscale levels of the light-emitting devices according to the instantaneous brightness distribution rules of the subframes. When driving the display panel to switch from a high-brightness mode to a low-brightness mode, the overall brightness is reduced by first decreasing the light-emitting phase duration of the subframe with the longest light-emitting phase, and then by reducing the number of subframes in a frame. When a frame includes one subframe, the low-brightness display of the display panel is achieved by reducing the instantaneous brightness of the light-emitting devices. When driving the display panel to adjust from a high-brightness mode to a low-brightness mode, the instantaneous brightness of the light-emitting devices is minimized, thereby ensuring that the light-emitting devices operate in a high uniformity and high-efficiency range.

[0064] In other embodiments of the present invention, the pixel circuit in the display panel includes a pulse width modulation circuit and an amplitude modulation circuit. The pulse width modulation circuit controls the duration of the driving current supplied to the light-emitting device, and the amplitude modulation circuit controls the magnitude of the driving current supplied to the light-emitting device. The display panel controls the display of grayscale levels by the light-emitting device according to grayscale distribution rules. When driving the display panel to switch from a high-brightness mode to a low-brightness mode, the overall brightness is first reduced by adjusting the effective light-emitting duration of the light-emitting device, and then the low-brightness display is achieved by reducing the instantaneous brightness of the light-emitting device in the low-brightness mode. When driving the display panel to adjust from a high-brightness mode to a low-brightness mode, the instantaneous brightness of the light-emitting device is minimized, thereby ensuring that the light-emitting device operates in a high uniformity and high-efficiency range.

[0065] The above is the overall technical concept of the present invention. The technical solution of the present invention will be described below with specific embodiments.

[0066] This invention provides a display panel, which includes multiple light-emitting devices and multiple pixel circuits, wherein the light-emitting devices are coupled to the pixel circuits. Figure 1 A pixel circuit schematic diagram provided for an embodiment of the present invention, such as... Figure 1As shown, the pixel circuit includes at least a driving transistor Tm, a data writing transistor M1, a light-emitting control transistor M2, and a storage capacitor Cst. The pixel circuit's operation includes a writing phase and a light-emitting phase. In the writing phase, the data writing transistor M1 is turned on under the control of the scan signal Scan, writing the data voltage Data to the gate of the driving transistor Tm. In the light-emitting phase, when the light-emitting control transistor M2 is turned on under the control of the light-emitting control signal Emit, the driving transistor Tm generates a driving current under the control of its gate voltage, and provides this driving current to the light-emitting device PD. Driving the light-emitting device PD to emit light also requires setting a first power supply voltage VDD and a second power supply voltage VEE. Optionally, the first power supply voltage VDD is the positive power supply voltage, and the second power supply voltage VEE is the negative power supply voltage. The effective pulse width of the light-emitting control signal Emit affects the duration of the light-emitting phase, which in turn affects the actual light-emitting time of the light-emitting device PD. By adjusting the effective pulse width of the light-emitting control signal Emit, the duration of the light-emitting phase can be controlled.

[0067] Figure 2 Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 2 As shown, the pixel circuit includes a driving transistor Tm, a data writing transistor M1, a gate reset transistor M3, a threshold compensation transistor M4, an electrode reset transistor M7, a first light-emitting control transistor M5, a second light-emitting control transistor M6, and a storage capacitor Cst. The operation of the pixel circuit includes at least a reset stage, a writing stage, and a light-emitting stage. In the reset stage, the gate reset transistor M3 is turned on under the control of the second scan signal S2 to write the reset signal Ref to the gate of the driving transistor Tm, and the electrode reset transistor M7 is turned on under the control of the second scan signal S2 to write the reset signal Ref to the electrode of the light-emitting device PD. In the writing stage, the data writing transistor M1 and the threshold compensation transistor M4 are turned on under the control of the first scan signal S1 to write the data voltage Data to the gate of the driving transistor Tm and to perform self-testing and compensation on the threshold voltage of the driving transistor Tm. In the light-emitting stage, the first light-emitting control transistor M5 and the second light-emitting control transistor M6 are turned on under the control of the light-emitting control signal Emit, and the driving transistor Tm generates a driving current under the control of its gate voltage and provides the driving current to the light-emitting device PD. The effective pulse width of the Emit control signal affects the duration of the light-emitting phase, which in turn affects the actual light-emitting time of the light-emitting device (PD). By adjusting the effective pulse width of the Emit control signal, the duration of the light-emitting phase can be controlled.

[0068] Figure 1 and Figure 2The pixel circuit is shown for illustrative purposes only and is not intended to limit the invention. The pixel circuit in the display panel provided by the present invention can be any type of circuit capable of adjusting the duration of the light-emitting phase during the operation of the pixel circuit.

[0069] The display panel provided in this embodiment of the invention includes at least one subframe in a frame. The operation of the pixel circuit in each subframe includes at least a writing phase and a light-emitting phase. In the subframe, during the writing phase, a data voltage Data is written to the gate of the driving transistor Tm. During the light-emitting phase, the driving transistor Tm generates a driving current and provides this current to the light-emitting device PD. The light-emitting device PD emits light under the control of the driving current. The instantaneous brightness of the light-emitting device PD is related to the driving current; the larger the driving current and the higher the current density, the greater the instantaneous brightness. The magnitude of the driving current is related to the data voltage Data. Therefore, the instantaneous brightness of the light-emitting device PD is related to the data voltage Data written during the writing phase. The brightness of the light-emitting device PD in a subframe is related to the instantaneous brightness and the light-emitting duration. When the instantaneous brightness is fixed, the longer the light-emitting duration, the greater the light-emitting brightness of the light-emitting device PD in the subframe. When a frame includes two or more subframes, the superposition of the light-emitting brightness of the light-emitting device PD in the two or more subframes constitutes the grayscale level displayed in that frame.

[0070] The display panel provided in this embodiment of the invention includes multiple brightness modes. In each brightness mode, the light-emitting device (PD) can achieve a grayscale display of 0-255 levels. A sub-frame instantaneous brightness allocation rule is used to control the grayscale level displayed by the PD in each brightness mode. The sub-frame instantaneous brightness allocation rule includes: the grayscale level displayed by the PD increases as its instantaneous brightness in the sub-frame increases; the PD reaches its maximum instantaneous brightness in the current sub-frame before being allocated to emit light in the next sub-frame; the duration of the emission phase in the next sub-frame is not less than the duration of the emission phase in the current sub-frame. Each sub-frame corresponds to its own maximum instantaneous brightness, and when displaying the maximum grayscale, the PD reaches its respective maximum instantaneous brightness in each sub-frame.

[0071] Taking a frame consisting of three subframes as an example, the instantaneous brightness allocation rules for subframes are explained. Figure 3 This is a schematic diagram illustrating the instantaneous brightness and grayscale level allocation of a subframe. Figure 3 The horizontal axis represents time, and the vertical axis represents brightness. For example... Figure 3 As shown, the display process of a picture is Frame, that is, a frame includes three subframes, namely Sub1, Sub2 and Sub3. Figure 3 The fill width of the graphic represents the duration of light emission by the light-emitting device (PD) in the subframe, and also represents the duration of the light emission phase in the subframe. Figure 3 The duration of the luminescence phases in Sub1, Sub2, and Sub3 gradually increases. Figure 3 From left to right, the grayscale levels displayed by the LEDs (PDs) gradually increase. When displaying low grayscale levels, the LEDs initially emit light only in subframe Sub1. The instantaneous brightness of the LED in subframe Sub1 increases, thus increasing the displayed grayscale levels. This change in instantaneous brightness is controlled by the data voltage (Data) written to subframe Sub1. When the LED reaches its maximum instantaneous brightness in subframe Sub1, the grayscale levels that can be displayed using one subframe reach their limit. To display even larger grayscale levels, the LED needs to continue emitting light in subframe Sub2. In other words, when displaying medium grayscale levels, the LED emits light in both subframes Sub1 and Subframe Sub2, with the LED reaching its maximum instantaneous brightness in subframe Sub1. When the LED reaches its maximum instantaneous brightness in both subframes Sub1 and Subframe Sub2, the grayscale levels that can be displayed using two subframes reach their limit. Then, the LED (PD) continues to emit light in subframe Sub3 to increase the number of displayable gray levels. For example, when displaying a high gray level, the LED emits light in subframes Sub1, Sub2, and Sub3, reaching its maximum instantaneous brightness in subframe Sub1 and Subframe Sub2. When the LED reaches its maximum instantaneous brightness in all three subframes, it can display the maximum gray level.

[0072] Using the above allocation rules, combined with the range of data voltage values ​​and the number of grayscale levels to be displayed, the data voltage to be written in each subframe for each grayscale level of the LED is allocated. For example, it is ultimately determined that controlling the LED to emit light in subframe Sub1 can display grayscale levels 0-70; controlling the LED to emit light in subframes Sub1 and Sub2 can display grayscale levels 71-200; and controlling the LED to emit light in all three subframes can display grayscale levels 201-255. When displaying low grayscale levels, priority is given to emitting light in subframes with shorter emission phase durations. As the displayed grayscale level increases, emission is only allowed in subframes with longer emission phase durations when the maximum instantaneous brightness is reached in subframes with shorter emission phase durations. When the grayscale level is low, the LED is only lit during the subframe with the shortest emission phase duration. The shorter the emission duration of the LED and the higher the current density, the better the performance of the LED. By using the subframe instantaneous brightness allocation rule provided in this embodiment of the invention to allocate different gray levels for the display of light-emitting devices, the luminous efficiency of the light-emitting devices can be improved, and the shift of emission wavelength can be avoided and the uniformity can be improved.

[0073] It should be noted that the instantaneous brightness of a light-emitting device (LED) generally refers to its luminous intensity measured within microseconds. The instantaneous brightness of an LED is analogous to its data voltage. The range of data voltages that a display driver chip in a finished electronic device can provide is fixed; that is, the data voltage written to the pixel circuit has a maximum and a minimum value. The maximum instantaneous brightness of the LED within a subframe generally refers to the extreme value of the written data voltage that maximizes the brightness achieved by the LED in that subframe. The instantaneous brightness of the LED (PD) in each subframe needs to be allocated according to grayscale levels, and this instantaneous brightness is related to the data voltage. However, since grayscale levels are discontinuous, the allocation may result in differences in the data voltage required for the maximum instantaneous brightness of the LED in different subframes, leading to variations in the maximum instantaneous brightness. It is understandable that, to make reasonable use of the available data voltage range, the extreme value of the data voltage should be written in each subframe to maximize the brightness of the LED (PD). Although the maximum instantaneous brightness of the LED (PD) differs across subframes, the brightness should still be relatively close, and the difference in the data voltage corresponding to the maximum instantaneous brightness in each subframe should not be too significant. For example, the data voltage difference corresponding to the maximum instantaneous brightness in different subframes is no greater than 0.2ΔV, where ΔV is the voltage difference between the maximum and minimum values ​​of the data voltage provided by the display panel.

[0074] This invention provides a driving method for a display panel, capable of driving the display panel to display a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode. The display panel displays the same image in different modes, i.e., displays the same grayscale level. The same grayscale level here can also be understood as a sub-pixel at a fixed position in the display panel displaying the same grayscale level in both brightness modes. When displaying the same image, the first brightness mode is a mode with a higher brightness than the second brightness mode. The driving method for the display panel includes:

[0075] In both the first and second brightness modes, the grayscale levels of the light-emitting device (PD) are controlled according to the above-mentioned subframe instantaneous brightness allocation rules;

[0076] In the first brightness mode, one frame of the display panel consists of N subframes, where N is an integer and N≥2. Optionally, at least two of the N subframes have different light-emitting phase durations; or, the light-emitting phase durations of the N subframes are all different.

[0077] In the second brightness mode, one frame of the display panel includes M subframes, where M is an integer and N≥M≥1; that is, the number of subframes in one frame in the second brightness mode is less than or equal to the number of subframes in one frame in the first brightness mode.

[0078] Among them, the maximum duration of the light-emitting stage in N sub-frames in the first brightness mode is t10, and t10 is greater than the maximum duration of the light-emitting stage in M sub-frames in the second brightness mode. That is, the duration of the light-emitting stage of the sub-frame with the longest light-emitting stage duration in the second brightness mode is less than the duration of the light-emitting stage of the sub-frame with the longest light-emitting stage duration in the first brightness mode. When M = N, the light-emitting duration of the sub-frame with the longest light-emitting stage duration is reduced in the second brightness mode; when M < N, the number of sub-frames included in one frame is reduced in the second brightness mode.

[0079] The driving method of the display panel provided by the embodiment of the present invention controls the light-emitting device to display the gray-scale level according to the instantaneous brightness distribution rule of sub-frames in each brightness mode. When driving the display panel to display different brightness modes, the overall brightness of the display panel is reduced by reducing the light-emitting duration of the sub-frame with the longest light-emitting stage duration or by reducing the number of sub-frames included in one frame, rather than simply reducing the instantaneous brightness of the light-emitting device to reduce the overall brightness of the display panel. Using the embodiment of the present invention can ensure that the light-emitting device works in the high uniformity and high efficiency range, thereby ensuring the efficiency and uniformity of the display panel.

[0080] In the embodiment of the present invention, the duration of the light-emitting stage is affected by the effective pulse width of the light-emitting control signal Emit. Specifically, in each brightness mode, the duration of the light-emitting stage is determined by testing the effective pulse width of the light-emitting control signal Emit in the sub-frame.

[0081] In some embodiments, the second brightness mode includes a first sub-brightness mode; in the first brightness mode, the duration of the light-emitting stage in the Nth sub-frame among the N sub-frames sorted by the duration of the light-emitting stage is t10, and the duration of the light-emitting stage in the (N - 1)th sub-frame is t11; in the first sub-brightness mode, M = N, and the duration of the light-emitting stage in the Mth sub-frame among the M sub-frames sorted by the duration of the light-emitting stage is t20, and the duration of the light-emitting stage in the (M - 1)th sub-frame is t21; where t10 > t20 and t11 ≥ t21.

[0082] Figure 4 It is a comparison schematic diagram of the first brightness mode and the first sub-brightness mode in the embodiment of the present invention. Figure 4 It shows the brightness distribution of each sub-frame when displaying the maximum gray scale in two brightness modes. When displaying the maximum gray-scale level, the light-emitting device reaches the maximum instantaneous brightness in each sub-frame. Taking the display of a picture Frame including three sub-frames as an example, that is, M = N = 3. Figure 4 The abscissa represents time and the ordinate represents brightness. As Figure 4As shown, in the first brightness mode mode1 and the first sub - brightness mode mode2 - 1, one frame includes three sub - frames. The three sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1, the second sub - frame Sub2, and the third sub - frame Sub3 respectively. In the first brightness mode mode1, the third sub - frame Sub3 is the sub - frame with the longest light - emitting stage duration, and its light - emitting stage duration is t10. The light - emitting stage duration of the second sub - frame Sub2 is t11, and t11 < t10. In the first sub - brightness mode mode2 - 1, the light - emitting stage duration of the third sub - frame Sub3 is t20, and the light - emitting stage duration of the second sub - frame Sub2 is t21, and t21 < t20. Optionally, the light - emitting stage duration in the first sub - frame Sub1 in the first brightness mode mode1 and the light - emitting stage duration in the first sub - frame Sub1 in the first sub - brightness mode mode2 - 1 are both t12, and t12 < t11 < t10. From Figure 4 it can be seen that t10 > t20, t11 = t21. In some other embodiments, it can also be t10 > t20, t11 > t21. The driving method provided by the embodiments of the present invention does not change the number of sub - frames included in one frame based on the first brightness mode mode1, and reduces the light - emitting duration of the sub - frame with the longest light - emitting stage duration at least to reduce the overall brightness of the display panel, realizing the display of the first sub - brightness mode mode2 - 1, and can ensure that the light - emitting device works in the high - uniformity and high - efficiency range, thereby ensuring the efficiency and uniformity of the display panel.

[0083] In some embodiments, Figure 5 This is another comparison schematic diagram of the first brightness mode and the first sub - brightness mode in the embodiments of the present invention. Figure 5 It shows the brightness distribution of each sub - frame when displaying the maximum gray level in two brightness modes. Taking the display of a picture Frame including three sub - frames as an example, that is, M = N = 3. As Figure 5 shown, in the first brightness mode and the first sub - brightness mode, the three sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1, the second sub - frame Sub2, and the third sub - frame Sub3 respectively. In the first brightness mode mode1, the light - emitting stage duration of the third sub - frame Sub3 is t10, the light - emitting stage duration of the second sub - frame Sub2 is t11, and the light - emitting stage duration in the first sub - frame Sub1 is t12. In the first sub - brightness mode mode2 - 1, the light - emitting stage duration of the third sub - frame Sub3 is t20, the light - emitting stage duration of the second sub - frame Sub2 is t21, and the light - emitting stage duration in the first sub - frame Sub1 is t12. Among them, t10 > t20, t21 < t11 = t20. Figure 5In the embodiment, the first sub - brightness mode mode2 - 1 can be considered as reducing the light - emitting stage duration of the 3rd sub - frame Sub3 in the first brightness mode mode1, and after the reduction of the light - emitting stage duration, it is shorter than the light - emitting stage duration of the 2nd sub - frame Sub2 in the first brightness mode mode1. Figure 5 In the first sub - brightness mode mode2 - 1, the three sub - frames are also sorted according to the light - emitting stage duration, and the light - emitting stage durations of the three sub - frames are different, where t12 < t21 < t20. Compared with the first brightness mode mode1, the first sub - brightness mode mode2 - 1 also reduces the overall brightness by reducing the light - emitting stage duration of one sub - frame.

[0084] Figure 4 and Figure 5 The embodiments can be combined and applied. The second brightness mode simultaneously includes Figure 4 the first sub - brightness mode mode2 - 1 in Figure 5 and the first sub - brightness mode mode2 - 1 in Figure 4 When displaying the same gray - scale level, the brightness of the display panel in the first sub - brightness mode mode2 - 1 in Figure 5 is greater than its brightness in the first sub - brightness mode mode2 - 1 in

[0085] In some embodiments, Figure 6 This is another comparison schematic diagram of the first brightness mode and the first sub - brightness mode in the embodiments of the present invention. Figure 6 It shows the brightness distribution of each sub - frame when displaying the maximum gray - scale in two brightness modes. Taking the display of a picture Frame including three sub - frames as an example, that is, M = N = 3. As Figure 6 shown, in the first brightness mode mode1 and the first sub - brightness mode mode2 - 1, the three sub - frames sorted according to the light - emitting stage duration are the 1st sub - frame Sub1, the 2nd sub - frame Sub2, and the 3rd sub - frame Sub3 respectively. In the first brightness mode mode1, the light - emitting stage duration of the 1st sub - frame Sub1 is t12, the light - emitting stage duration of the 2nd sub - frame Sub2 is t11, and the light - emitting stage duration of the 3rd sub - frame Sub3 is t10. In the first sub - brightness mode mode2 - 1, the light - emitting stage duration of the 1st sub - frame Sub1 is t12, the light - emitting stage duration of the 2nd sub - frame Sub2 is t21, and the light - emitting stage duration of the 3rd sub - frame Sub3 is t20. Among them, t12 < t11 < t10, t21 = t11 = t20. That is to say, in the first sub - brightness mode mode2 - 1, the light - emitting stage durations of the 2nd sub - frame Sub2 and the 3rd sub - frame Sub3 are equal. Figure 6In the embodiment, the first sub-brightness mode mode2-1 can be considered as the first brightness mode mode1, with the light emission phase duration of the third subframe Sub3 in the first brightness mode mode1 reduced, and the reduced light emission duration is equal to the light emission phase duration of the second subframe Sub2 in the first brightness mode mode1.

[0086] Figure 4 and Figure 6 The embodiments can be combined with applications, and the second brightness mode also includes Figure 4 The first sub-brightness mode mode2-1 and Figure 6 The first sub-brightness mode is mode2-1. When displaying the same grayscale level, the display panel... Figure 4 The brightness of the first sub-brightness mode (mode2-1) is greater than its brightness in the middle. Figure 6 The brightness under the first sub-brightness mode, mode2-1.

[0087] Figure 5 and Figure 6 The embodiments can be combined with applications, and the second brightness mode also includes Figure 5 The first sub-brightness mode mode2-1 and Figure 6 The first sub-luminance mode is mode2-1. Because in... Figure 5 In the embodiment, under the first sub-brightness mode mode2-1, the light emission phase duration t21 of the second sub-frame Sub2 is less than the light emission phase duration t20 of the third sub-frame Sub3, then the light-emitting device in... Figure 5 In the embodiment, the brightness corresponding to the maximum gray level under the first sub-brightness mode mode2-1 is less than its... Figure 6 The brightness corresponding to the maximum grayscale level under the first sub-brightness mode (mode2-1) in this embodiment. When displaying the same grayscale level, the display panel... Figure 5 The brightness of the first sub-brightness mode (mode2-1) is less than its brightness in the middle. Figure 6 The brightness under the first sub-brightness mode, mode2-1.

[0088] In some implementations... Figure 7 This is another comparative schematic diagram of the first brightness mode and the first sub-brightness mode in an embodiment of the present invention. Figure 7 This illustrates the brightness distribution of each subframe when displaying the maximum grayscale in two brightness modes. Taking a frame containing three subframes as an example, where M=N=3. Figure 7As shown, in the first brightness mode mode1 and the first sub - brightness mode mode2 - 1, the three sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1, the second sub - frame Sub2, and the third sub - frame Sub3. In the first brightness mode mode1, the relationship of the light - emitting durations of the three sub - frames is t12 < t11 < t10. In the first sub - brightness mode mode2 - 1, the relationship of the light - emitting durations of the three sub - frames is t12 < t21 < t20. Among them, t21 < t11 and t20 < t10. In this embodiment, the first sub - brightness mode mode2 - 1 reduces the overall brightness by simultaneously reducing the durations of the light - emitting stages of two sub - frames based on the first brightness mode mode1.

[0089] In some embodiments, N≥3; the duration of the light - emitting stage in the i - th sub - frame sorted by the duration of the light - emitting stage in the first brightness mode is equal to the duration of the light - emitting stage in the i - th sub - frame sorted by the duration of the light - emitting stage in the first sub - brightness mode, where i is an integer and 1≤i < N - 1. Taking Figure 4 the N = 3 in the embodiment as an example, i = 1, the duration of the light - emitting stage in the first sub - frame Sub1 in the first brightness mode model is equal to the duration of the light - emitting stage in the first sub - frame Sub1 in the first sub - brightness mode model. When Figure 4 N = 4 in the embodiment, i can take values of 1 and 2. Then, the duration of the light - emitting stage in the first sub - frame sorted by the duration of the light - emitting stage in the first brightness mode model is equal to the duration of the light - emitting stage in the first sub - frame sorted by the duration of the light - emitting stage in the first sub - brightness mode model, and the duration of the light - emitting stage in the second sub - frame sorted by the duration of the light - emitting stage in the first brightness mode model is equal to the duration of the light - emitting stage in the second sub - frame sorted by the duration of the light - emitting stage in the first sub - brightness mode model. The driving method provided by this embodiment reduces the overall brightness by reducing the duration of the light - emitting stage of the sub - frame with the longest light - emitting stage duration while not changing the duration of the light - emitting stages of the remaining sub - frames.

[0090] In some embodiments, the display panel includes multiple light - emitting control lines Emit (using the same label as the light - emitting control signal Emit), and the pixel circuit is coupled to the light - emitting control line Emit; the light - emitting control line Emit provides an effective pulse during the light - emitting stage. The driving method includes: in the first brightness mode, the maximum effective pulse width of the signal provided by the light - emitting control line in N sub - frames is t1, and t1 is greater than the maximum effective pulse width of the signal provided by the light - emitting control line in M sub - frames in the second brightness mode. The effective pulse width is the width of the effective pulse signal.

[0091] Figure 8 This is a timing comparison diagram of the first brightness mode and the second brightness mode in the embodiments of the present invention. As Figure 8As shown, taking N=M=3 as an example, in both brightness modes, the three subframes ordered by the duration of the emission phase are subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3). (Compare) Figure 1 To understand this, we can use a schematic diagram of the pixel circuit. The display panel also includes scan lines (marked with the same symbols as the scan signal). The operation of the pixel circuit in each subframe includes at least a writing phase P1 and a light-emitting phase P2. Figure 8 In the diagram, D1, D2, and D3 represent the data writing voltage, Data. Figure 8 The diagram illustrates that in the first brightness mode (mode 1), the effective pulse width of the signal provided by the emission control line Emit in the third subframe (Sub 3) is the largest (taking a low-level signal as an example), with a maximum effective pulse width of t10. This maximum effective pulse width is the same as the maximum duration of the emission phase in the N subframes under the first brightness mode (mode 1). In the second brightness mode (mode 2), the effective pulse width of the signal provided by the emission control line Emit in the third subframe (Sub 3) is the largest, and the maximum effective pulse width is t2. Where t10 > t2. In the driving method provided by this embodiment, the duration of the emission phase in a subframe is determined by the effective pulse width of the emission control line Emit in the subframe. For example, when N = M, based on the first brightness mode (mode 1), by reducing the effective pulse width in the subframe with the longest effective pulse width of the emission control line Emit, the emission duration of the subframe with the longest emission phase is reduced, thereby reducing the overall brightness and realizing the second brightness mode (mode 2). For example, when N>M, the number of times the Emit control line provides a valid pulse signal in the next frame of the first brightness mode (mode2) is greater than the number of times the Emit control line provides a valid pulse signal in the next frame of the second brightness mode (mode2).

[0092] Figure 8 The timing diagram in the second brightness mode (mode2) can be compared with the above. Figure 4 Matching the first sub-luminance mode mode2-1 in the middle. Figure 8 In both brightness modes, the three subframes are ordered according to the duration of the emission phase. In the first brightness mode (mode1), the effective pulse width of the emission control line Emit in the first subframe (Sub1) is equal to the effective pulse width of the emission control line Emit in the first subframe (Sub1) of the second brightness mode (mode2). Similarly, the effective pulse width of the emission control line Emit in the second subframe (Sub2) of the first brightness mode (mode1) is equal to the effective pulse width of the emission control line Emit in the second subframe (Sub2) of the second brightness mode (mode2). Furthermore, the effective pulse width of the emission control line Emit in the third subframe (Sub3) of the first brightness mode (mode1) is greater than the effective pulse width of the emission control line Emit in the third subframe (Sub3) of the second brightness mode (mode2). This enables the display to be driven. Figure 4Schematic first brightness mode mode1 and first sub - brightness mode mode2 - 1.

[0093] In some other embodiments, Figure 9 This is another timing comparison diagram of the first brightness mode and the second brightness mode in the embodiments of the present invention. As Figure 9 shown, taking N = M = 3 as an example, in the two brightness modes, the three sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1, the second sub - frame Sub2, and the third sub - frame Sub3 respectively. In the first brightness mode mode1, the effective pulse width of the light - emitting control line Emit in the first sub - frame Sub1 is t12, and in the second brightness mode mode2, the effective pulse width of the light - emitting control line Emit in the first sub - frame Sub1 is t12. In the first brightness mode mode1, the effective pulse width of the light - emitting control line Emit in the second sub - frame Sub2 is t11, and in the second brightness mode mode2, the effective pulse width of the light - emitting control line Emit in the second sub - frame Sub2 is t21, and t21 = t11. In the first brightness mode mode1, the effective pulse width of the light - emitting control line Emit in the third sub - frame Sub3 is t10, and in the second brightness mode mode2, the effective pulse width of the light - emitting control line Emit in the third sub - frame Sub3 is t20, t20 < t10, and t20 = t21. The timing diagram in the second brightness mode mode2 in this embodiment can match the above - mentioned Figure 6 first sub - brightness mode mode2 - 1. In this way, it can realize driving display Figure 6 Schematic first brightness mode mode1 and first sub - brightness mode mode2 - 1.

[0094] In some embodiments, the second brightness mode includes a second sub - brightness mode; in the first brightness mode, the duration of the light - emitting stage in the Nth sub - frame among the N sub - frames sorted by the duration of the light - emitting stage is t10, and in the second sub - brightness mode, 1 < M < N, and the duration of the light - emitting stage in the Mth sub - frame among the M sub - frames sorted by the duration of the light - emitting stage is t22; t10 > t22. This embodiment reduces the overall brightness by reducing the number of sub - frames included in one frame.

[0095] In one embodiment, Figure 10 This is a comparison schematic diagram of the first brightness mode and the second sub - brightness mode in the embodiments of the present invention. Figure 10 It shows the brightness distribution of each sub - frame when displaying the maximum gray scale in two brightness modes. Taking N = 3, M = 2 as an example. As Figure 10As shown, in the first brightness mode (mode1), the three subframes ordered by the duration of the emission phase are subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3); in the second sub-brightness mode (mode2-2), the two subframes ordered by the duration of the emission phase are subframe 1 (Sub1) and subframe 2 (Sub2). Specifically, the emission phase duration of subframe 3 (Sub3) in the first brightness mode (mode1) is t10, and the emission phase duration of subframe 2 (Sub2) in the second sub-brightness mode (mode2-2) is t22, where t10 > t22.

[0096] Additionally, in the first brightness mode (mode1), the duration of the light emission phase of the second subframe Sub2 is t11, optionally t11 ≥ t22. When t11 = t22, and the duration of the light emission phase of the first subframe Sub1 in the first brightness mode (mode1) and the duration of the light emission phase of the first subframe Sub1 in the second brightness mode (mode2-2) are both t12, the second sub-brightness mode (mode2-2) is essentially implemented by reducing the longest light emission duration of the subframe based on the first brightness mode (mode1). In this case, the second sub-brightness mode (mode2-2) is the first type of second sub-brightness mode (mode2-2). When t11 > t22, and the light-emitting phase duration of the first sub-frame Sub1 under the first brightness mode (mode1) and the light-emitting phase duration of the first sub-frame Sub1 under the second brightness mode (mode2-2) are both t12, the second sub-brightness mode (mode2-2) is essentially achieved by reducing the longest light-emitting sub-frame from the first brightness mode (mode1) and simultaneously reducing the light-emitting phase duration of the second sub-frame Sub2. In this case, the second sub-brightness mode (mode2-2) is the second type of second sub-brightness mode (mode2-2). When the display panel includes both the first and second sub-brightness modes (mode2-2 and mode2-2), when displaying the same grayscale level, the brightness of the display panel under the first sub-brightness mode (mode2-2) is greater than its brightness under the second sub-brightness mode (mode2-2).

[0097] in addition, Figure 10 In this embodiment, the second sub-brightness mode mode2-2 can be used in combination with the first sub-brightness mode mode2-1 in the above embodiment. When the second brightness mode includes both the first sub-brightness mode mode2-1 and the second sub-brightness mode mode2-2, the brightness of the display panel under the first sub-brightness mode mode2-1 is greater than its brightness under the second sub-brightness mode mode2-2 when displaying the same grayscale level.

[0098] In this embodiment of the invention, the second sub-brightness mode mode2-2 is essentially achieved by reducing the number of subframes in one frame compared to the first brightness mode mode1. The difference between the number of subframes in the next frame of the second sub-brightness mode mode2-2 and the number of subframes in the next frame of the first brightness mode mode1 can be 1, 2, or 3. Specifically, it can be set according to the number of brightness modes that the display panel needs to display. For example, in the first embodiment, N=4 in the first brightness mode mode1 and M=2 in the second sub-brightness mode mode2-2.

[0099] It should be noted that in this embodiment of the invention, the overall brightness is reduced by decreasing the number of subframes included in a single frame, such as... Figure 10 The diagram illustrates the first brightness mode (mode1) and the second sub-brightness mode (mode2-2). Although the number of subframes included in the next frame under the second sub-brightness mode (mode2-2) is reduced, the image refresh rate is not changed in this embodiment of the invention. Therefore, it can be understood that the time required to display one frame is the same under both the first brightness mode (mode1) and the second sub-brightness mode (mode2-2).

[0100] In some implementations, M = N-1. This implementation reduces the overall brightness of the display panel based on the first brightness mode (mode1) by subtracting one subframe from each frame, thus achieving a second sub-brightness mode (mode2-2). Furthermore, an even lower brightness mode can be achieved by further subtracting one subframe from each frame in the second sub-brightness mode (mode2-2). This configuration allows for more brightness modes on the display panel, improving the user experience.

[0101] In some implementations, the duration of the light emission phase in the j-th subframe sorted by the duration of the light emission phase under the second sub-luminance mode mode2-2 is equal to the duration of the light emission phase in the j-th subframe sorted by the duration of the light emission phase under the first luminance mode mode1, where j is an integer, 1≤j≤M. For example... Figure 10 As shown, taking M=2 as an example, in the second sub-brightness mode mode2-2, the duration of the light-emitting phase in the first sub-frame sorted by the duration of the light-emitting phase is equal to the duration of the light-emitting phase in the first sub-frame sorted by the duration of the light-emitting phase in the first brightness mode mode1. Similarly, in the second sub-brightness mode mode2-2, the duration of the light-emitting phase in the second sub-frame sorted by the duration of the light-emitting phase is equal to the duration of the light-emitting phase in the second sub-frame sorted by the duration of the light-emitting phase in the first brightness mode mode1. If multiple brightness modes are set in the display panel, the brightness of the display panel gradually changes in each brightness mode when displaying the same grayscale level. The design using this embodiment of the invention can utilize either varying the light-emitting duration or reducing the number of sub-frames to design adjacent brightness modes, thus allowing for more brightness mode divisions and improving the user experience.

[0102] In some embodiments, Figure 11 This is a comparative schematic diagram of the second sub - brightness mode and the third sub - brightness mode in an embodiment of the present invention. Figure 11 It shows the brightness distribution of each sub - frame when displaying the maximum gray level in two brightness modes. Taking M = 2 as an example. As Figure 11 shown, in the second sub - brightness mode mode2 - 2, the two sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1 and the second sub - frame Sub2 respectively. In the third sub - brightness mode mode2 - 3, the two sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1 and the second sub - frame Sub2 respectively. Among them, the duration of the light - emitting stage of the second sub - frame Sub2 in the second sub - brightness mode mode2 - 2 is t22, and the duration of the light - emitting stage of the second sub - frame Sub2 in the third sub - brightness mode mode2 - 3 is t23, where t23 < t22. The duration of the light - emitting stage of the first sub - frame Sub1 in the second sub - brightness mode mode2 - 2 and the duration of the light - emitting stage of the first sub - frame Sub1 in the third sub - brightness mode mode2 - 3 are both t12. This embodiment realizes the third sub - brightness mode by reducing the duration of the light - emitting stage of the second sub - frame Sub2 on the basis of the second sub - brightness mode, and can achieve that when displaying the same gray - level grade, the brightness of the display panel in the second sub - brightness mode mode2 - 2 is greater than its brightness in the third sub - brightness mode mode2 - 3.

[0103] In other embodiments, the second brightness mode further includes a fourth sub - brightness mode, in which M = 1. Figure 12 This is a comparative schematic diagram of the second sub - brightness mode and the fourth sub - brightness mode in an embodiment of the present invention. Figure 12 It shows the brightness distribution of each sub - frame when displaying the maximum gray level in two brightness modes. As Figure 12 shown, in the second sub - brightness mode mode2 - 2, one frame includes two sub - frames, and the two sub - frames sorted by the duration of the light - emitting stage are the first sub - frame Sub1 and the second sub - frame Sub2 respectively. And the duration of the light - emitting stage in the first sub - frame Sub1 sorted by the duration of the light - emitting stage is t12. In the fourth sub - brightness mode mode2 - 4, M = 1, and only one sub - frame Sub1 is included, and the duration of the light - emitting stage in this sub - frame is t24, where t24 ≤ t12. In this embodiment, the fourth sub - brightness mode mode2 - 4 is equivalent to reducing the number of sub - frames in one frame on the basis of the second sub - brightness mode mode2 - 2. When displaying the same gray - level grade, the brightness of the display panel in the second sub - brightness mode mode2 - 2 is greater than its brightness in the fourth sub - brightness mode mode2 - 4.

[0104] In some implementations, the second brightness mode includes a third sub-brightness mode (mode2-3) and a fourth sub-brightness mode (mode2-4). When displaying the same grayscale level, the brightness of the display panel in the third sub-brightness mode (mode2-3) is greater than its brightness in the fourth sub-brightness mode (mode2-4).

[0105] In other embodiments, the second brightness mode further includes a fifth sub-brightness mode, in which M=1. When displaying the same grayscale level, the brightness of the display panel in the fourth sub-brightness mode is greater than its brightness in the fifth sub-brightness mode. Figure 13 This is a comparative schematic diagram of the fourth and fifth sub-brightness modes in an embodiment of the present invention. Figure 13 This illustrates the brightness distribution of subframes when displaying the maximum grayscale in two brightness modes. For example... Figure 13 As shown, each frame in the fourth sub-brightness mode (mode2-4) and the fifth sub-brightness mode (mode2-5) includes a sub-frame Sub1. In the fourth sub-brightness mode (mode2-4), the duration of the light-emitting phase in sub-frame Sub1 is t24; in the fifth sub-brightness mode (mode2-5), the duration of the light-emitting phase in sub-frame Sub1 is t25, where t25 = t24. The instantaneous brightness of the light-emitting device (PD) when displaying the maximum grayscale in the fourth sub-brightness mode (mode2-4) is greater than its instantaneous brightness when displaying the maximum grayscale in the fifth sub-brightness mode (mode2-5).

[0106] Combination Figure 1For an understanding of the schematic pixel circuit, the working process of the pixel circuit in a sub-frame includes a writing stage and a light-emitting stage; in the writing stage, a data voltage is written into the pixel circuit, and the instantaneous brightness of the light-emitting device PD in the sub-frame is related to the written data voltage. Among them, in the fourth sub-brightness mode mode2-4, the data voltage written in the writing stage in the sub-frame when the light-emitting device PD displays the maximum gray level is V1; in the fifth sub-brightness mode mode2-5, the duration of the light-emitting stage in the sub-frame is t25, t25 = t24, and the data voltage written in the writing stage in the sub-frame when the light-emitting device PD displays the maximum gray level is V2, and V2 ≠ V1. For example, when the driving transistor Tm in the pixel circuit is a p-type transistor, setting V2 > V1 can make the instantaneous brightness of the light-emitting device PD when displaying the maximum gray level in the fourth sub-brightness mode mode2-4 greater than its instantaneous brightness when displaying the maximum gray level in the fifth sub-brightness mode mode2-5. When the driving transistor Tm in the pixel circuit is an n-type transistor, setting V2 < V1 can make the instantaneous brightness of the light-emitting device PD when displaying the maximum gray level in the fourth sub-brightness mode mode2-4 greater than its instantaneous brightness when displaying the maximum gray level in the fifth sub-brightness mode mode2-5. In the low-brightness mode, when a frame of the display panel includes only one sub-frame, the instantaneous brightness of the light-emitting device PD can be adjusted by adjusting the data voltage to reduce the overall brightness of the display panel.

[0107] In the driving method provided by the embodiments of the present invention, a frame of the display panel includes at least one sub-frame, and the display panel controls the light-emitting device to display gray level grades according to the sub-frame instantaneous brightness distribution rule. When driving the display panel to switch from the high-brightness mode to the low-brightness mode for display, first, without changing the number of sub-frames included in a frame, but reducing the light-emitting stage duration of the sub-frame with the longest light-emitting stage duration in a frame to reduce the overall brightness. To continue reducing the overall brightness, then the overall brightness can be reduced by reducing the number of sub-frames in a frame, where the light-emitting duration of the sub-frame with the longest initial light-emitting duration is gradually reduced to zero duration, which is equivalent to reducing one sub-frame. After reducing the number of sub-frames in a frame, the overall brightness can still be reduced by reducing the light-emitting stage duration of the sub-frame with the longest light-emitting stage duration among the remaining sub-frames. After reducing the number of sub-frames in a frame, when there are still at least two sub-frames in a frame, the overall brightness can continue to be reduced by reducing the number of sub-frames. When a frame includes one sub-frame, the low-brightness display of the display panel is achieved by reducing the instantaneous brightness of the light-emitting device. When driving the display panel to adjust from the high-brightness mode to the low-brightness mode, the instantaneous brightness of the light-emitting device is not reduced as much as possible, thereby ensuring that the light-emitting device operates in a high uniformity and high efficiency range.

[0108] In some embodiments, the operation process of the pixel circuit at least includes a writing stage and a light-emitting stage; in the writing stage, the scan line Scan provides an effective pulse signal and writes a data voltage Data into the pixel circuit; in the light-emitting stage, the light-emitting control line Emit provides an effective pulse signal to cause the pixel circuit to provide a driving current to the light-emitting device PD. Figure 14 This is another timing comparison diagram of the first brightness mode and the second brightness mode in the embodiments of the present invention. Taking M < N, M = 2, N = 3 as an example, Figure 14 illustrates the writing stage P1 and the light-emitting stage P2 of the operation of the pixel circuit. Figure 14 In it, D1, D2, and D3 represent the written data voltage Data. As Figure 14 shown, in the first brightness mode model, one frame includes three sub-frames, namely the first sub-frame Sub1, the second sub-frame Sub2, and the third sub-frame Sub3. In each sub-frame, the light-emitting control line Emit provides an effective pulse once, and the time interval between the starting moments of providing effective pulses by the light-emitting control line Emit in two adjacent sub-frames is △tE1. Figure 14 In it, the starting moment of the falling edge of the effective pulse is recorded as the starting moment of the effective pulse. In the second brightness mode mode2, one frame includes two sub-frames, namely the first sub-frame Sub1 and the second sub-frame Sub2. In each sub-frame, the light-emitting control line Emit provides an effective pulse once. In the second brightness mode mode2, the sub-frame includes adjacent first sub-frame Z1 and second sub-frame Z2, and the time interval between the starting moments of providing effective pulses by the light-emitting control line Emit in the first sub-frame Z1 and the second sub-frame Z2 is △tE2; △tE2 > △tE1. Among them, the first sub-frame Z1 and the second sub-frame Z2 may belong to the same frame, that is, the first sub-frame Z1 and the second sub-frame Z2 are two sub-frames in the same displayed picture; or, the first sub-frame Z1 and the second sub-frame Z2 may also belong to different frames. Figure 14 It is schematically shown with the first sub-frame Z1 and the second sub-frame Z2 belonging to different frames.

[0109] In this embodiment, by adjusting the time interval between the starting moments of providing effective pulses by the light-emitting control line Emit in two adjacent sub-frames, the time interval between two adjacent sub-frames can be adjusted, and thus the time interval between two adjacent light-emitting stages P can be adjusted. In this way, it is possible to reduce the number of sub-frames included in one frame time, and it can cooperate with the implementation of the second brightness mode display with a reduced number of sub-frames. As Figure 10 In the second sub-brightness mode mode2-2 in the second brightness mode schematically shown in the embodiment, it can be implemented by using Figure 14 the timing schematically shown. As Figure 11 the third sub-brightness mode mode2-3 schematically shown in the embodiment, Figure 12 the fourth sub-brightness mode mode2-4 schematically shown in the embodiment can all be implemented by using Figure 14 The timing is illustrated in the diagram.

[0110] Figure 14 The diagram illustrates the use of adjacent subframes Z1 and Z2 belonging to different frames. In the second brightness mode (mode2), the interval between the start times of the effective pulses provided by the emission control line Emit in the first subframe Z1 and the second subframe Z2 is lengthened. In other embodiments, the first subframe Z1 and the second subframe Z2 belong to the same subframe. The second brightness mode (mode2) is achieved by adjusting the interval between the start times of the effective pulses provided by the emission control line Emit in two adjacent subframes within a single subframe.

[0111] In some implementations, the driving method includes: the period of an effective pulse provided by the scan line Scan in a first brightness mode mode is equal to the period of an effective pulse provided by it in a second brightness mode mode 2; in the second brightness mode mode 2, between the writing phase of the first subframe and the writing phase of the second subframe, the scan line Scan provides one effective pulse, and the data line Data writes a dark state voltage or a bias voltage to the pixel circuit. Figure 14 As shown, in the first brightness mode (mode 2), the interval between the start times of the effective pulse provided by the scan line Scan in any two adjacent subframes is ΔtE3, and the scan line Scan provides a periodic pulse signal. In the second brightness mode (mode 2), the interval between the start times of the effective pulse provided by the scan line Scan in any two adjacent subframes is ΔtE4, where ΔtE4 = ΔtE3. This implementation is applied to the scheme where M ≥ 2 in the second brightness mode (mode 2). Compared to the first brightness mode (mode 2), the period of the effective pulse provided by the scan line Scan is not changed in the second brightness mode (mode 2), but the number of subframes included in one frame is reduced only by adjusting the interval between the start times of the effective pulse provided by the emission control line Emit in two adjacent subframes. Figure 14 In this embodiment, within one frame of the second brightness mode (mode2), the scan line (Scan) has a valid pulse period during which no data voltage needs to be written. For example... Figure 14The P3 period, as indicated in the diagram, has no emission phase P2 between it and the next valid pulse (or, in other words, there is no valid pulse for the emission control line Emit between two valid pulses of the scan line Scan). That is, the P3 period lies between the write phase P1 of the first subframe Z1 and the write phase of the second subframe Z2. Since the scan line Scan controls the writing of the data voltage Data, the valid pulse of the scan line Scan during the P3 period will control the data writing transistor to turn on. At this time, a dark state voltage can be written into the pixel circuit through the data line, so that the light-emitting device PD will not emit light until the next consecutive write and emission phases arrive. Alternatively, for similar... Figure 2 In terms of the circuit, a bias voltage can be written into the pixel circuit using the data line during the P3 period to adjust the bias state of the driving transistor Tm and improve the problem of the threshold voltage of the driving transistor Tm shifting after long-term use.

[0112] In some implementations, such as Figure 14 As shown, in the second brightness mode (mode2), M ≥ 2; the subframes in the second brightness mode (mode2) include the adjacent third subframe Z3 and fourth subframe Z4. The start time interval of the effective pulse provided by the emission control line Emit in the third subframe Z3 and the fourth subframe Z4 is ΔtE1. The third subframe Z3 and the fourth subframe Z4 can belong to the same frame, or they can belong to two adjacent frames. Figure 14 The diagram illustrates that the third subframe Z3 and the fourth subframe Z4 belong to the same frame. In this embodiment, under the second brightness mode (mode2), M≥2. The subframes within the second brightness mode (mode2) include the adjacent first subframe Z1 and second subframe Z2, as well as the adjacent third subframe Z3 and fourth subframe Z4. When M=2, since a frame only includes two subframes, the naming of the first subframe Z1, second subframe Z2, third subframe Z3, and fourth subframe Z4 is only to describe the characteristics of the effective pulse signal of the emission control line Emit, and the naming does not limit their temporal order within a frame. Figure 14As shown in the figure, the second sub-frame Sub2 in a frame can be the first sub-frame Z1 in the relationship with the adjacent first sub-frame Z1 and second sub-frame Z2, and the second sub-frame Sub2 in a frame can also be the fourth sub-frame Z4 in the relationship with the adjacent third sub-frame Z3 and fourth sub-frame Z4. For the driving method provided by the embodiments of the present invention, compared with the first brightness mode mode1, the starting time interval of the effective pulses provided by the light-emitting control line Emit in some adjacent two sub-frames is adjusted, and the starting time interval of the effective pulses provided by the light-emitting control line Emit in some adjacent two sub-frames is still set to be ΔtE1. In this way, it is possible to reduce the number of sub-frames included in one frame time and achieve the display of the second brightness mode with a reduced number of sub-frames. Moreover, this implementation mode is equivalent to only adjusting the interval time between some adjacent effective pulses in the light-emitting control line Emit, while the interval time between some adjacent effective pulses remains unchanged, which can also facilitate the cooperation between the scan line Scan and the light-emitting control line Emit. For example, it can be set that the scan line Scan outputs pulse signals with the same period in the first brightness mode mode1 and the second brightness mode mode2.

[0113] In some other embodiments, Figure 15 This is another timing comparison diagram of the first brightness mode and the second brightness mode in the embodiments of the present invention. Taking M < N, M = 2, N = 3 as an example, Figure 15 It shows the writing stage P1 and the light-emitting stage P2 of the pixel circuit working. Figure 15 In the figure, D1, D2, and D3 represent the writing data voltage Data. As Figure 15 shown, in the first brightness mode model, a frame includes three sub-frames, namely the first sub-frame Sub1, the second sub-frame Sub2, and the third sub-frame Sub3. In the first brightness mode model, the period of the effective pulses provided by the light-emitting control line Emit is T1. Figure 15The period T1 is calculated using the time interval between the start times of two adjacent valid pulses in the Emit control line (e.g., the start of the falling edge). Since the duration of the emission phase may differ in different subframes, the pulse width of the valid pulses provided by the Emit control line within multiple subframes of a single frame may vary. Therefore, calculating the period using the time interval between the start times of two adjacent valid pulses in the Emit control line is more accurate. In the second brightness mode (mode2), the period of the valid pulses provided by the Emit control line is T2; T2 > T1. In this embodiment, the number of subframes included in the next frame of the second brightness mode (mode2) is less than the number of subframes included in the next frame of the first brightness mode (mode1). In both the first brightness mode (mode1) and the second brightness mode (mode2), the Emit control line provides periodic pulse signals, and T2 > T1. This setting facilitates the generation of emission control signals on the Emit control line, and the interval between adjacent emission phases P2 is more uniform in the second brightness mode (mode2), improving the display effect in the second brightness mode (mode2).

[0114] In some implementations, such as Figure 15 As shown, the driving method includes: in the first brightness mode (mode 1), the period of the effective pulse provided by the scan line Scan is T1; in the second brightness mode (mode 2), the period of the effective pulse provided by the scan line Scan is T2. The period is calculated by the time interval between the start times of two adjacent effective pulses in the scan line Scan (e.g., the start of the falling edge). In this embodiment, in the first brightness mode (mode 1), the period of the effective pulse provided by the scan line Scan is the same as the period of the effective pulse provided by the emissive control line Emit; in the second brightness mode (mode 2), the period of the effective pulse provided by the scan line Scan is the same as the period of the effective pulse provided by the emissive control line Emit. The scan line Scan and the emissive control line Emit cooperate to drive the pixel circuit to achieve display in each brightness mode.

[0115] In some implementations, in the first brightness mode (mode1), the duration of the light emission phase P2 of the N subframes displayed in chronological order gradually increases or decreases; and / or, in the second brightness mode (mode2), M ≥ 2, the duration of the light emission phase P2 of the M subframes displayed in chronological order gradually increases or decreases. Figure 14As illustrated, in the first brightness mode (mode1), the duration of the light emission phase P2 of the first subframe Sub1, the second subframe Sub2, and the third subframe Sub3, displayed in chronological order, gradually increases; in the second brightness mode (mode2), the duration of the light emission phase P2 of the first subframe Sub1 and the second subframe Sub2, displayed in chronological order, gradually increases. This embodiment, by setting the duration of the light emission phase of multiple subframes displayed in chronological order to gradually change in each brightness mode, makes the regularity of the effective pulses provided by the emission control line Emit stronger, and the driving method simpler.

[0116] In this embodiment of the invention, the display grayscale level of the light-emitting device is controlled according to the instantaneous brightness allocation rule of the subframe. It is necessary to set a gamma curve for each subframe, and the gamma curves included in different subframes in a frame are different.

[0117] In the first brightness mode, N subframes correspond to N first gamma curves. The nth subframe displayed in chronological order among the N subframes includes the nth first gamma curve, where n is an integer, 1≤n≤N. When the light-emitting device PD is displayed in the nth subframe, it converts the grayscale information into data voltage according to the nth first gamma curve.

[0118] Taking N=3 as an example, Figure 16 This is a schematic diagram of a driving method provided in an embodiment of the present invention. Figure 16 The driving process in the first brightness mode is illustrated. Figure 16 This diagram illustrates two frames displayed in chronological order. Each frame comprises three subframes: Subframe 1 (Sub1), Subframe 2 (Sub2), and Subframe 3 (Sub3). Subframe 1 corresponds to the first gamma curve Gamma1-1, Subframe 2 corresponds to the second gamma curve Gamma1-2, and Subframe 3 corresponds to the third gamma curve Gamma1-3. When Subframe 1 is displayed, grayscale information is converted into data voltage based on the first gamma curve Gamma1-1. During the writing phase P1, this data voltage is written to the pixel circuit. Then, during the emission phase P2, the pixel circuit provides driving current to the light-emitting device (PD) to control its emission. For a single PD, the sum of its brightness across the three subframes represents the brightness corresponding to its grayscale level in a single frame.

[0119] Correspondingly, in the second brightness mode, M subframes correspond to M second gamma curves. The m-th subframe displayed sequentially among the M subframes includes the m-th second gamma curve, where m is an integer, 1 ≤ m ≤ M. When the light-emitting device (PD) displays the m-th subframe, it converts the grayscale information into data voltage according to the m-th second gamma curve. The m second gamma curves in the second brightness mode are all different, and the corresponding gamma curve is called in each subframe for data voltage conversion.

[0120] Based on the same inventive concept, embodiments of the present invention also provide another driving method for a display panel. A frame of the display panel includes at least one subframe, and the operation of the pixel circuit in the subframe includes at least a writing phase and a light-emitting phase. The pixel circuit can be as described above. Figure 1 or Figure 2 The schematic structure is shown. The display panel includes a first mode, and the driving method includes: in the first mode, the subframes include a fifth subframe and a sixth subframe. When the light-emitting device (PD) displays the first grayscale level: in the fifth subframe, the duration of the light-emitting phase is t1, and the data voltage of the corresponding write phase is V3; in the sixth subframe, the duration of the light-emitting phase is t2, and the data voltage of the corresponding write phase is V4; and t1 ≤ t2; where,

[0121] ││V4│-│V3││≤0.2△V, where △V is the voltage difference between the maximum and minimum values ​​of the data voltage provided by the display panel; or, the driving transistor in the pixel circuit is an n-type transistor and V3>V4, or the driving transistor in the pixel circuit is a p-type transistor and V3<V4.

[0122] Figure 17 This is a schematic diagram of a subframe state in the first mode provided by an embodiment of the present invention. Figure 18 This is a schematic diagram of another subframe state in the first mode provided by an embodiment of the present invention. Figure 17 and Figure 18 These diagrams illustrate the state of the light-emitting device (PD) when displaying the first grayscale level. Taking the first mode, where one frame consists of two subframes as an example, these two subframes are the fifth subframe Z5 and the sixth subframe Z6. The horizontal axis represents time, and the vertical axis represents brightness. Figure 17 and Figure 18 The width of the filled graphic on the horizontal axis represents the duration of the luminescence phase in the subframe.

[0123] like Figure 17As shown, when the light-emitting device PD emits light in the first mode and displays the first gray-scale level, the duration of the light-emitting phase in the fifth sub-frame Z5 is t1, and the duration of the light-emitting phase in the sixth sub-frame Z6 is t2, where t1 < t2. Among them, the data voltage in the writing phase corresponding to the fifth sub-frame Z5 is V3, and the data voltage in the writing phase corresponding to the sixth sub-frame Z6 is V4, and V3 ≠ V4, ││V4│ - │V3││ ≤ 0.2△V, where △V is the voltage difference between the maximum value and the minimum value of the data voltage provided by the display panel. That is to say, the difference between the absolute values of the data voltages written in the fifth sub-frame Z5 and the sixth sub-frame Z6 is not greater than 20% of the data voltage amplitude (i.e., △V). That is to say, the data voltages written in the fifth sub-frame Z5 and the sixth sub-frame Z6 are less different, so that the instantaneous brightness difference of the light-emitting device PD in the fifth sub-frame Z5 and the sixth sub-frame Z6 is small or approximately the same. Among them, when the light-emitting device PD reaches the maximum instantaneous brightness in the fifth sub-frame Z5 and also reaches the maximum instantaneous brightness in the sixth sub-frame Z6, the first gray-scale level can be the maximum gray-scale level displayed by the light-emitting device PD in the first mode.

[0124] In some embodiments, ││V4│ - │V3││ < 0.5V.

[0125] In some embodiments, ││V4│ - │V3││ ≤ 0.1△V, that is, the difference between the absolute values of the data voltages written in the fifth sub-frame Z5 and the sixth sub-frame Z6 is not greater than 10% of the data voltage amplitude.

[0126] As Figure 18 shown, when the light-emitting device PD emits light in the first mode and displays the first gray-scale level, the duration of the light-emitting phase in the fifth sub-frame Z5 is t1, and the duration of the light-emitting phase in the sixth sub-frame Z6 is t2, where t1 < t2. Among them, the data voltage in the writing phase corresponding to the fifth sub-frame Z5 is V3, and the data voltage in the writing phase corresponding to the sixth sub-frame Z6 is V4. The driving transistor Tm in the pixel circuit is a p-type transistor and V3 < V4. When the driving transistor Tm in the pixel circuit is a p-type transistor, the smaller the data voltage, the larger the driving current generated by the driving transistor Tm. Then the driving current in the fifth sub-frame Z5 is greater than the driving current in the sixth sub-frame Z6, so that the instantaneous brightness of the light-emitting device PD in the fifth sub-frame Z5 is greater than its instantaneous brightness in the sixth sub-frame Z6. Correspondingly, when the driving transistor Tm in the pixel circuit is an n-type transistor, set V3 > V4. The larger the data voltage, the larger the driving current generated by the driving transistor Tm, so that the driving current in the fifth sub-frame Z5 is greater than the driving current in the sixth sub-frame Z6, so that the instantaneous brightness of the light-emitting device PD in the fifth sub-frame Z5 is greater than its instantaneous brightness in the sixth sub-frame Z6. Among them, the first gray-scale level can be a certain fixed gray-scale level, and this gray-scale level is not the maximum gray-scale level.

[0127] Figure 17 and Figure 18 are both illustrated with t1 < t2. When t1 = t2, it means that one frame includes two sub - frames with the same light - emitting duration. When t1 = t2, the data voltage during the writing stage corresponding to the fifth sub - frame Z5 is V3, and the data voltage during the writing stage corresponding to the sixth sub - frame Z6 is V4, ││V4│ - │V3││≤0.2△V. This can also make the instantaneous brightness difference of the light - emitting device PD in the fifth sub - frame Z5 and the sixth sub - frame Z6 relatively small or approximately the same. The first gray - scale level is the maximum gray - scale level displayed by the light - emitting device PD in the first mode. When t1 = t2, the data voltage during the writing stage corresponding to the fifth sub - frame Z5 is V3, and the data voltage during the writing stage corresponding to the sixth sub - frame Z6 is V4. If the driving transistor in the pixel circuit is an n - type transistor and V3 > V4, or if the driving transistor in the pixel circuit is a p - type transistor and V3 < V4, the instantaneous brightness of the light - emitting device PD in the fifth sub - frame Z5 is greater than its instantaneous brightness in the sixth sub - frame Z6. The first gray - scale level can be applied as a non - maximum gray - scale level. When displaying the first gray - scale level, the shorter the light - emitting stage duration of the sub - frame, the greater the driving current provided to the light - emitting device PD, and the greater the instantaneous brightness of the light - emitting device PD in that sub - frame.

[0128] The driving method provided by the embodiment of the present invention sets that one frame of the display panel includes at least one sub - frame. In the first mode, the sub - frame includes the fifth sub - frame Z5 and the sixth sub - frame Z6. The light - emitting stage duration in the fifth sub - frame Z5 is set not to be greater than the light - emitting stage duration in the sixth sub - frame Z6, and the relationship between the data voltages written in the fifth sub - frame Z5 and the sixth sub - frame Z6 is set. When displaying the first gray - scale level in the first mode, when the difference between the data voltages written in the light - emitting device in the fifth sub - frame Z5 and the sixth sub - frame Z6 is relatively small, and when the light - emitting device PD reaches the maximum instantaneous brightness in the fifth sub - frame Z5 and also reaches the maximum instantaneous brightness in the sixth sub - frame Z6, the first gray - scale level can be the maximum gray - scale level displayed by the light - emitting device PD in the first mode. When setting a specific size relationship between V3 and V4 according to the type of the driving transistor Tm, it can make the instantaneous brightness of the light - emitting device PD in the fifth sub - frame Z5 greater than its instantaneous brightness in the sixth sub - frame Z6, and the first gray - scale level can be applied as a non - maximum gray - scale level.

[0129] The driving method provided by the embodiment of the present invention is equivalent to setting a sub-frame instantaneous brightness allocation rule. Among them, when displaying non-maximum gray-scale levels, for two different sub-frames, the driving current provided to the light-emitting device PD in the sub-frame with a shorter light-emitting stage duration is larger. That is, the shorter the light-emitting stage duration of the sub-frame, the greater the instantaneous brightness of the light-emitting device PD in this sub-frame. In other words, for two different sub-frames, when the maximum instantaneous brightness is reached in the sub-frame with a shorter light-emitting stage duration, the light-emitting device is configured to emit light in the sub-frame with a longer light-emitting stage duration. In addition, when displaying the maximum gray-scale level, the maximum driving current is respectively provided to the light-emitting device PD in two different sub-frames, that is, the light-emitting device PD reaches the maximum instantaneous brightness in both of the two different sub-frames. Adopting the driving method provided by the embodiment of the present invention can improve the light-emitting efficiency of the light-emitting device, and can avoid the shift of the emission wavelength and improve the uniformity.

[0130] In some embodiments, the first mode includes a first sub-mode and a second sub-mode. When displaying the same gray-scale level, the brightness of the display panel in the first sub-mode is greater than its brightness in the second sub-mode. In the first sub-mode, one frame of the display panel includes N sub-frames, N is an integer, N≥2, and the N sub-frames include a fifth sub-frame and a sixth sub-frame; in the second sub-mode, one frame of the display panel includes M sub-frames, M is an integer, N≥M≥2, and the M sub-frames include a fifth sub-frame and a sixth sub-frame; among them, the maximum duration of the light-emitting stage in the N sub-frames in the first sub-mode is t70, and the maximum duration of the light-emitting stage in the M sub-frames in the second sub-mode is t80, t70>t80. That is, the light-emitting stage duration of the sub-frame with the longest light-emitting stage duration in the second sub-mode is less than the light-emitting stage duration of the sub-frame with the longest light-emitting stage duration in the first sub-mode. When M = N, the light-emitting duration of the sub-frame with the longest light-emitting stage duration is reduced in the second sub-mode; when M < N, the number of sub-frames included in one frame is reduced in the second sub-mode. The embodiment of the present invention reduces the overall brightness of the display panel by reducing the light-emitting duration of the sub-frame with the longest light-emitting stage duration or by reducing the number of sub-frames included in one frame, rather than simply reducing the instantaneous brightness of the light-emitting device to reduce the overall brightness of the display panel. Adopting the embodiment of the present invention can ensure that the light-emitting device operates in the high-uniformity and high-efficiency range, thereby ensuring the efficiency and uniformity of the display panel.

[0131] In one embodiment, take N = 3 and M = 3 as an example. Figure 19 It is a comparison schematic diagram of the first sub-mode and the second sub-mode in the embodiment of the present invention. Figure 19 In the abscissa represents time and the ordinate represents brightness. As Figure 19 shown,

[0132] In the first sub-mode (1mode), one frame of the display panel consists of three subframes, ordered by emission time as subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3), with the emission duration of subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3) gradually increasing. The three subframes include a fifth subframe (Z5) and a sixth subframe (Z6). For example, subframe 2 (Sub2) is the fifth subframe (Z5), and subframe 3 (Sub3) is the sixth subframe (Z6).

[0133] In the second sub-mode (2mode), one frame of the display panel consists of three subframes, ordered by emission time as subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3), with the emission duration of subframe 1 (Sub1), subframe 2 (Sub2), and subframe 3 (Sub3) gradually increasing. The three subframes include a fifth subframe (Z5) and a sixth subframe (Z6). For example, subframe 2 (Sub2) is the fifth subframe (Z5), and subframe 3 (Sub3) is the sixth subframe (Z6); alternatively, subframe 1 (Sub1) can be the fifth subframe (Z5), and subframe 2 (Sub2) can be the sixth subframe (Z6).

[0134] In the first sub-mode 1, the maximum duration of the light-emitting phase in the three sub-frames is t70, and in the second sub-mode 2, the maximum duration of the light-emitting phase in the three sub-frames is t80, where t70 > t80. Specifically, in the first sub-mode 1, the duration of the light-emitting phase of the third sub-frame Sub3 is t70, and in the second sub-mode 2, the duration of the light-emitting phase of the third sub-frame Sub3 is t80. Optionally, in the first sub-mode 1, the duration of the light-emitting phase of the second sub-frame Sub2 is t71, and in the second sub-mode 2, the duration of the light-emitting phase of the second sub-frame Sub2 is t81, where t71 = t81; in the first sub-mode 1, the duration of the light-emitting phase of the first sub-frame Sub1 is t72, and in the second sub-mode 2, the duration of the light-emitting phase of the first sub-frame Sub1 is t82, where t72 = t82. This implementation reduces the overall brightness of the display panel by decreasing the light-emitting duration of the sub-frame with the longest light-emitting phase.

[0135] Understandable. Figure 19 In the embodiment, the first sub-mode 1mode is equivalent to Figure 4 The first brightness mode in the embodiment is mode1. Figure 19 In the embodiment, the second sub-mode 2mode is equivalent to Figure 4 The first sub-luminance mode in the embodiment is mode2-1.

[0136] In some embodiments, in the first sub-mode 1mode, among the N sub-frames sorted by the duration of the light-emitting phase, the duration of the light-emitting phase in the Nth sub-frame is t70, and the duration of the light-emitting phase in the (N - 1)th sub-frame is t71; in the second sub-mode 2mode, M = N, among the M sub-frames sorted by the duration of the light-emitting phase, the duration of the light-emitting phase in the Mth sub-frame is t80, and the duration of the light-emitting phase in the (M - 1)th sub-frame is t81; where t81 ≤ t71 ≤ t80. Figure 19 Taking M = N = 3 as an example, the case of t81 = t71 < t80 is illustrated.

[0137] In other embodiments, t81 < t71 = t80. Taking N = 3 and M = 3 as an example. Figure 20 This is another comparison schematic diagram of the first sub-mode and the second sub-mode in the embodiments of the present invention. As Figure 20 shown, in the first sub-mode 1mode and the second sub-mode 2mode, one frame of the display panel includes 3 sub-frames. The three sub-frames sorted by the duration of the light-emitting phase are the 1st sub-frame Sub1, the 2nd sub-frame Sub2, and the 3rd sub-frame Sub3, and the 1st sub-frame Sub1, the 2nd sub-frame Sub2, and the 3rd sub-frame Sub3 are also sorted by the light-emitting time. The duration of the light-emitting phase of the 3rd sub-frame Sub3 in the first sub-mode 1mode is t70, the duration of the light-emitting phase of the 2nd sub-frame Sub2 is t71, and the duration of the light-emitting phase of the 1st sub-frame Sub1 is t72; the duration of the light-emitting phase of the 3rd sub-frame Sub3 in the second sub-mode 2mode is t80, the duration of the light-emitting phase of the 2nd sub-frame Sub2 is t81, and the duration of the light-emitting phase of the 1st sub-frame Sub1 is t82. Among them, t80 < t70, t81 < t71 = t80, and t72 = t82. Figure 19 In the embodiments, the second sub-mode 2mode can be considered as, on the basis of the first sub-mode 1mode, reducing the duration of the light-emitting phase of the 3rd sub-frame Sub3 in the first sub-mode 1mode, and after the reduction of the duration of the light-emitting phase, it is shorter than the duration of the light-emitting phase of the 2nd sub-frame Sub2 in the first sub-mode 1mode. This embodiment reduces the overall brightness of the display panel by reducing the light-emitting duration of the sub-frame with the longest light-emitting phase duration.

[0138] It can be understood that Figure 20 the first sub-mode 1mode in the embodiments is equivalent to Figure 5 the first brightness mode mode1 in the embodiments, Figure 20 the second sub-mode 2mode in the embodiments is equivalent to Figure 5 the first sub-brightness mode mode2-1 in the embodiments.

[0139] In some embodiments, in the first sub-mode 1mode, in the Nth sub-frame among the N sub-frames sorted by the duration of the light-emitting phase in the first sub-mode 1mode, the duration of the light-emitting phase is t70, and in the (N - 1)th sub-frame, the duration of the light-emitting phase is t71; in the second sub-mode 2mode, M < N, in the Mth sub-frame among the M sub-frames sorted by the duration of the light-emitting phase in the second sub-mode 2mode, the duration of the light-emitting phase is t80, and t80 ≤ t71. This embodiment reduces the overall brightness by reducing the number of sub-frames included in one frame.

[0140] Taking N = 3 and M = 2 as an example. Figure 21 Another comparison schematic diagram of the first sub-mode and the second sub-mode in the embodiment of the present invention. As Figure 21 shown, in the first sub-mode 1mode, one frame of the display panel includes 3 sub-frames. The three sub-frames sorted by the duration of the light-emitting phase are the 1st sub-frame Sub1, the 2nd sub-frame Sub2, and the 3rd sub-frame Sub3, and the 1st sub-frame Sub1, the 2nd sub-frame Sub2, and the 3rd sub-frame Sub3 are also sorted by the light-emitting time. In the second sub-mode 2mode, one frame of the display panel includes 2 sub-frames. The two sub-frames sorted by the duration of the light-emitting phase are the 1st sub-frame Sub1 and the 2nd sub-frame Sub2, and the 1st sub-frame Sub1 and the 2nd sub-frame Sub2 are also sorted by the light-emitting time. In the first sub-mode 1mode, the duration of the light-emitting phase of the 3rd sub-frame Sub3 is t70, the duration of the light-emitting phase of the 2nd sub-frame Sub2 is t71, and the duration of the light-emitting phase of the 1st sub-frame Sub1 is t72. In the second sub-mode 2mode, the duration of the light-emitting phase of the 2nd sub-frame Sub2 is t80, and the duration of the light-emitting phase of the 1st sub-frame Sub1 is t82. Among them, t80 ≤ t71.

[0141] When t71 = t80, and the duration of the light emission phase of the first subframe Sub1 under the first submode 1 (t72) is equal to the duration of the light emission phase of the first subframe Sub1 under the second submode 2 (t82), the second submode 2 is essentially implemented by reducing the longest light emission duration of the subframe based on the first submode 1. This second submode 2 is the first type of second submode 2. When t71 > t80, and the duration of the light emission phase of the first subframe Sub1 under the first submode 1 (t72) is equal to the duration of the light emission phase of the first subframe Sub1 under the second submode 2 (t82), the second submode 2 is essentially implemented by reducing the longest light emission duration of the subframe based on the first submode 1, while also reducing the duration of the light emission phase of the second subframe Sub2. This second submode 2 is the second type of second submode 2. When the display panel includes both a first second sub-mode 2mode and a second second sub-mode 2mode, the brightness of the display panel in the first second sub-mode 2mode is greater than its brightness in the second second sub-mode 2mode when displaying the same grayscale level.

[0142] Understandable. Figure 21 In the embodiment, the first sub-mode 1mode is equivalent to Figure 10 The first brightness mode in the embodiment is mode1. Figure 21 In the embodiment, the second sub-mode 2mode is equivalent to Figure 10 The second sub-brightness mode in the embodiment is mode2-2.

[0143] In some embodiments, when M < N, in the first sub-mode 1mode, one frame includes a fifth sub-frame and a sixth sub-frame. When the light-emitting device PD displays the first gray-scale level, the data voltage in the writing stage corresponding to the fifth sub-frame is V31; in the second sub-mode 2mode, one frame includes a fifth sub-frame and a sixth sub-frame. When the light-emitting device PD displays the first gray-scale level, the data voltage in the writing stage corresponding to the fifth sub-frame is V32; where, ││V31│ - │V32││ ≤ 0.2△V. There is a certain relationship between the light-emitting durations of the fifth sub-frame and the sixth sub-frame in one frame and the data voltage when displaying the first gray-scale level. The relationship characteristics of the fifth sub-frame and the sixth sub-frame need to be understood in another mode. For example, there is no necessary connection between the light-emitting duration of the fifth sub-frame in the first sub-mode 1mode and the light-emitting duration of the fifth sub-frame in the second sub-mode 2mode. In the embodiments of the present invention, it is set that in two sub-modes, when the light-emitting device PD displays the first gray-scale level, the difference in the absolute values of the data voltages written in the fifth sub-frame is relatively small. When the first gray-scale level is the maximum gray-scale level, it means that in the first sub-mode 1mode and the second sub-mode 2mode, when the light-emitting device PD displays the first gray-scale level, it has the maximum driving current in the fifth sub-frame, and the light-emitting device PD reaches the maximum instantaneous brightness.

[0144] In some other embodiments, in the first sub-mode 1mode, the light-emitting duration of the light-emitting stage in the first sub-frame among the N sub-frames sorted by the light-emitting stage duration is t72; the display panel further includes a second mode. When displaying the same gray-scale level, the brightness of the display panel in the first sub-mode is greater than its brightness in the second mode; in the second mode, one frame of the display panel includes one sub-frame, and the light-emitting duration of the light-emitting stage in the sub-frame is t91, and the data voltage corresponding to when the light-emitting device displays the maximum instantaneous brightness is V5; where, t91 ≤ t72, ││V5│ - │V3││ ≤ 0.2△V, and / or, ││V5│ - │V4││ ≤ 0.2△V.

[0145] Taking N = 3 as an example, Figure 22 is another comparison schematic diagram of the first sub-mode and the second mode in the embodiments of the present invention. As Figure 22 shown, in the first sub-mode 1mode, one frame of the display panel includes 3 sub-frames. The three sub-frames sorted by the light-emitting stage duration are the first sub-frame Sub1, the second sub-frame Sub2, and the third sub-frame Sub3, and the first sub-frame Sub1, the second sub-frame Sub2, and the third sub-frame Sub3 are also sorted by the light-emitting time. For example, the second sub-frame Sub2 is the fifth sub-frame Z5, the third sub-frame Sub3 is the sixth sub-frame Z6, the data voltage of the writing stage corresponding to the second sub-frame Sub2 is V3, and the data voltage of the writing stage corresponding to the third sub-frame Sub3 is V4.

[0146] In the second mode (3mode), one frame of the display panel includes one subframe, Sub1. The light-emitting phase duration of subframe Sub1 is t91, and the data voltage corresponding to the light-emitting device displaying the maximum grayscale level is V5. Among these, Figure 22 This illustrates the state of each subframe in the two modes when displaying the first grayscale level, where t91≤t72,││V5│-│V3││≤0.2△V, and / or,││V5│-│V4││≤0.2△V.

[0147] The second mode (3mode) is a low-brightness mode for the display panel. This is achieved by reducing the number of subframes in a single frame, setting each frame to include only one subframe. In 3mode, the light-emitting device (PD) needs to emit light in one subframe to achieve a grayscale display of 0-255 levels. The data voltage required to display the maximum grayscale level in 3mode is V5, which is not significantly different from V3 and V4. In the first submode (1mode), when displaying the first grayscale level, the fifth subframe Z5 corresponds to data voltage V3, and the sixth frame Z6 corresponds to data voltage V4. The first grayscale level can be the maximum grayscale level in the first submode (1mode).

[0148] Understandable. Figure 22 In the embodiment, the second mode 3mode is equivalent to Figure 12 The fourth sub-brightness mode in the embodiment is mode2-4.

[0149] Based on the same inventive concept, embodiments of the present invention also provide another driving method for a display panel, applied to a display panel whose pixel circuit includes a pulse width modulation circuit and an amplitude modulation circuit.

[0150] Figure 23 This is another pixel circuit schematic diagram provided in an embodiment of the present invention. Figure 24 for Figure 23 A timing diagram of a pixel circuit provided in the embodiment. For example... Figure 23 As shown, the pixel circuit includes a first driving circuit 10 and a second driving circuit 20. The first driving circuit 10 is configured to control the duration of providing driving current to the light-emitting device PD based on a first data voltage PWM-data, and the second driving circuit 20 is configured to control the amplitude of providing driving current to the light-emitting device PD based on a second data voltage PAM-data.

[0151] The first driving circuit 10 includes a first driving transistor M1, a first gate reset transistor M2, a first data write transistor M3, a first compensation transistor M4, a first control transistor M6, a third control transistor M5, and a first capacitor C1. The first capacitor C1 is the storage capacitor in the first driving circuit 10, and can also be referred to as the first storage capacitor in the pixel circuit. The third control transistor M5 is connected between the second power supply voltage line PWM-Vdd and the first terminal of the second driving transistor M1. The first control transistor M6 is connected between the second terminal of the first driving transistor M1 and the first node N1. The first data write transistor M3 is connected to the first terminal of the first driving transistor M1. The first compensation transistor M4 is connected to the second terminal and the gate of the first driving transistor M1. The first gate reset transistor M2 is connected to the gate of the first driving transistor M1. The first plate of the first capacitor C1 is connected to the gate of the first driving transistor M1, and the second plate of the first capacitor C1 is connected to the sweep frequency signal terminal SWEEP. The gate of the first gate reset transistor M2 receives the third scan signal PWM-S1, and the gates of the first data write transistor M3 and the first compensation transistor M4 receive the fourth scan signal PWM-S2. The gates of the first control transistor M6 and the third control transistor M5 receive the first light-emitting control signal PWM-EM.

[0152] The second driving circuit 20 includes a second driving transistor M7, a second gate reset transistor M8, a second data write transistor M9, a second compensation transistor M10, a second control transistor M11, a fourth control transistor M12, an electrode reset transistor M13, and a second capacitor C2. The second control transistor M11 is connected between the first power supply voltage line PAM-vdd and the first electrode of the second driving transistor M7. The fourth control transistor M12 is connected between the second electrode of the second driving transistor M7 and the light-emitting element LD. The second driving transistor M7 is configured to generate a driving current under the control of its gate voltage, and its gate is connected to the first node N1. The second data write transistor M9 is connected to the first electrode of the second driving transistor M7. The second compensation transistor M10 is connected to the second electrode and gate of the second driving transistor M7. The second gate reset transistor M8 is connected to the gate of the second driving transistor M7. The electrode reset transistor M13 is connected to the first electrode of the light-emitting device PD. The fourth control transistor M12 is also connected to the first electrode of the light-emitting device PD. The second electrode of the light-emitting device PD is connected to the third power supply voltage line VEE. Specifically, the gate of the second gate reset transistor M8 receives the first scan signal PAM-S1; the gates of the second data write transistor M9, the second compensation transistor M10, and the electrode reset transistor M13 receive the second scan signal PAM-S2. The gates of the second control transistor M11 and the fourth control transistor M12 receive the second light emission control signal PAM-EM.

[0153] Figure 23 The diagram illustrates that the first terminal of the electrode reset transistor M13 is connected to the third power supply voltage line PVEE. In other embodiments, the first terminal of the electrode reset transistor M13 receives a second reset signal PAM-REF, meaning the first terminal of the electrode reset transistor M13 and the first terminal of the second gate reset transistor M8 receive the same signal. In still other embodiments, the first terminal of the electrode reset transistor M13 is not connected to the third power supply voltage line PVEE, and the first terminal of the electrode reset transistor M13 and the first terminal of the second gate reset transistor M8 receive different signals; these are not illustrated in the diagrams below.

[0154] like Figure 24 As shown, the operation of the pixel circuit in one frame of the display panel includes a writing stage P1 and a light-emitting stage P2. The writing stage P1 is further divided into a first writing stage P11 and a second writing stage P12.

[0155] In the first write phase P11, the second driving circuit 20 sequentially executes the gate reset phase p11 and the data write phase p12. In the gate reset phase p11, the first scan signal PAM-S1, at an enable level, controls the second gate reset transistor M8 to turn on, writing the second reset signal PAM-REF to the gate of the second driving transistor M7, thus resetting the gate of the second driving transistor M7. In the data write phase p12, the second scan signal PAM-S2, at an enable level, controls the second data write transistor M9 and the second compensation transistor M10 to turn on, writing the second data signal PAM-Data to the gate of the second driving transistor M7 and performing threshold compensation; during this phase, the electrode reset transistor M13 turns on to reset the electrodes of the light-emitting device PD.

[0156] In the second write phase P12, the first drive circuit 10 sequentially executes the gate reset phase p21 and the data write phase p22. In the gate reset phase p21, the third scan signal PWM-S1, at an enable level, controls the first gate reset transistor M2 to turn on, and writes the third reset signal PWM-REF to the gate of the second drive transistor M1, resetting the gate of the first drive transistor M1. In the data write phase p22, the fourth scan signal PWM-S2, at an enable level, controls the first data write transistor M3 and the first compensation transistor M4 to turn on, writing the first data signal PWM-Data to the gate of the first drive transistor M1 and performing threshold compensation.

[0157] The light-emitting phase P2 is not the effective light-emitting phase of the light-emitting device PD. The light-emitting phase includes both effective light-emitting periods and non-light-emitting periods. The light-emitting phase P2 can be understood as the phase in which the second light-emitting control signal PAM-EM and the first light-emitting control signal PWM-EM are at the enable level. In the light-emitting phase P2, the second light-emitting control signal PAM-EM controls the second control transistor M11 and the fourth control transistor M12 to turn on. The second driving transistor M7 generates a driving current under the control of its gate voltage, and the second driving circuit 20 provides a driving current to the light-emitting device PD. The first light-emitting control signal PWM-EM controls the first control transistor M6 and the third control transistor M5 to turn on. At the same time, the voltage value of the sweep frequency signal SWEEP (which uses the same marking as the sweep frequency signal terminal SWEEP) gradually changes, and the voltage of the gate of the first driving transistor M1 changes due to the coupling effect of the first capacitor C1. When the gate voltage of the first driving transistor M1 is equal to (or less than) the absolute value of the difference between its source voltage and threshold voltage, the first driving transistor M1 is turned on. The first driving circuit 10 gradually raises the potential of the first node N1. Finally, the second driving transistor M1 is turned on, supplying the second power supply voltage PWM-Vdd (marked with the same symbol as the second power supply voltage line) to the first node N1 via the first control transistor M6. This causes a change in the gate voltage of the first driving transistor M7, causing the second driving transistor M7 to turn off, thereby stopping the supply of driving current to the light-emitting device PD. During the light-emitting stage P2, a control current is generated based on the control of the first data voltage PWM-Vdata and the sweep frequency signal SWEEP in the first driving circuit 10 to control the duration of the driving current supplied by the second driving circuit 20, thereby adjusting the effective light-emitting duration of the light-emitting device PD and thus controlling the light-emitting brightness of the light-emitting device PD.

[0158] Figure 24 The diagram illustrates time point t′, which is the time point when the second driving transistor M7 is turned off. Therefore, the time period between the effective pulse start time of the second light-emitting control signal PAM-EM and time point t′ is the effective light-emitting period Tt of the light-emitting device PD.

[0159] Figure 25 This is another pixel circuit schematic diagram provided in an embodiment of the present invention. Figure 25 The transistors in the first driving circuit 10 and the second driving circuit 20 can be referred to Figure 23 The examples are used for understanding. Figure 25As shown, the second driving circuit 20 also includes a light-emitting duration control transistor M14, which is electrically connected between the second driving transistor M7 and the light-emitting device PD. The output terminal of the first driving circuit 10 is electrically connected to the gate of the light-emitting duration control transistor M14. In this embodiment, the driving current generated by the first driving transistor M7 can only be provided to the light-emitting device PD when the light-emitting duration control transistor M14 is in the on state. By controlling the light-emitting duration control transistor M14 to turn off through the first driving circuit 10, the path between the second driving transistor M7 and the light-emitting device PD is cut off, and the second driving circuit 20 stops providing driving current to the light-emitting device PD, thereby realizing the control of the driving current flow period.

[0160] like Figure 25 As shown, the second driving circuit 20 also includes a light-emitting reset circuit 21. The light-emitting reset circuit 21 is connected between the first reset signal line Vset and the gate of the light-emitting duration control transistor M14. The light-emitting reset circuit 21 is configured to reset the gate of the light-emitting duration control transistor M14 using the first reset signal Vset provided by the first reset signal line Vset. The control terminal of the light-emitting reset circuit 21 is connected to the reset control line SET, which provides the reset control signal SET. Specifically, before the light-emitting stage P2, the reset control line SET provides an enable signal to control the light-emitting reset circuit 21 to turn on, causing the first reset signal Vset to reset the gate of the light-emitting duration control transistor M14.

[0161] The light-emitting reset circuit 21 includes a light-emitting reset transistor M15. The gate of the light-emitting reset transistor M15 is connected to the reset control line SET, the first terminal of the light-emitting reset transistor M15 is connected to the first reset signal line Vset, and the second terminal of the light-emitting reset transistor M15 is connected to the gate of the light-emitting duration control transistor M14. The light-emitting reset circuit 21 also includes a stabilizing capacitor C0, which is used to stabilize the potential of the gate of the light-emitting duration control transistor M14. One plate of the stabilizing capacitor C0 is connected to the first reset signal line Vset, and the other plate is connected to the gate of the light-emitting duration control transistor M14.

[0162] This invention provides a driving method that can be used to drive a display panel to display a first brightness mode and a second brightness mode, wherein, when displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode; the light-emitting device PD includes a first color light-emitting device.

[0163] Figure 26 This is another comparative diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention. Figure 26The horizontal coordinate represents time, and the vertical coordinate represents instantaneous brightness,示意了第一颜色发光器件在两种模式下显示最大灰阶等级Gmax时的有效发光时长和瞬时亮度。如 Figure 26 所示,驱动方法包括:

[0164] In the first brightness mode MM1, when the first-color light-emitting device displays the maximum gray scale Gmax, the first data voltage written in the writing stage P1 is PWM-data11, the second data voltage written is PAM-data1, and the effective light-emitting duration in the light-emitting stage is t31; in the first brightness mode, the gray scale levels of the light-emitting device PD are controlled according to the gray scale allocation rule; the gray scale allocation rule includes: the second data voltage PAM-data written in the writing stage is fixed, and the gray scale level displayed by the light-emitting device PD changes with the change of the first data voltage PWM-data. From the above description of the working process of the pixel circuit, it can be known that the change of the first data voltage PWM-data affects the effective light-emitting duration of the light-emitting device PD, and the first data voltage PWM-data affects the magnitude of the driving current provided to the light-emitting device PD, that is, it affects the instantaneous brightness of the light-emitting device PD. The gray scale allocation rule is to control the gray scale level displayed by the light-emitting device PD by adjusting the time length of the driving current provided to the light-emitting device PD without changing the magnitude of the driving current provided to the light-emitting device PD.

[0165] In the second brightness mode MM2, when the first-color light-emitting device displays the maximum gray scale Gmax, the first data voltage written in the writing stage P1 is PWM-data21, the second data voltage written is PAM-data2, and the effective light-emitting duration of the light-emitting stage P2 is t41; in the second brightness mode MM2, the gray scale levels of the light-emitting device PD are controlled according to the gray scale allocation rule.

[0166] Among them, PWM-data21≠PWM-data11, PAM-data2 = PAM-data1, t41 < t31. That is to say, in the two brightness modes, when the first-color light-emitting device displays the same gray scale level, the second data voltage PAM-data written to the pixel circuit remains unchanged, but the effective light-emitting duration of the first-color light-emitting device is affected by adjusting the magnitude of the first data voltage PWM-data written, so as to adjust the brightness of the first-color light-emitting device in different brightness modes. Different color light-emitting devices in the display panel can all be adjusted in the above way to adjust the brightness, so as to realize the adjustment of the overall brightness of the display panel.

[0167] The driving method provided in this embodiment, when driving the display panel to switch from a high-brightness mode to a low-brightness mode, does not change the second data voltage PAM-data, but adjusts the effective light-emitting duration of the light-emitting device by adjusting the magnitude of the first data voltage PWM-data, thereby reducing the overall brightness. The second data voltage PAM-data affects the magnitude of the driving current, and thus the current density. This embodiment of the invention, when driving the display panel to adjust from a high-brightness mode to a low-brightness mode, tries to avoid reducing the current density, thereby ensuring that the light-emitting device operates in a high-uniformity and high-efficiency range.

[0168] In some implementations... Figure 27 This is another comparative diagram of the first brightness mode and the second brightness mode in an embodiment of the present invention. Figure 27 The horizontal axis represents time, and the vertical axis represents instantaneous brightness. This illustrates the effective emission duration and instantaneous brightness of the first-color light-emitting device when displaying the maximum grayscale level, and the effective emission duration and instantaneous brightness when displaying the minimum grayscale level, in two modes. Gmax represents the maximum grayscale level, and Gmix represents the minimum grayscale level. The first-color light-emitting device can be any one of a red, green, or blue light-emitting device. For example... Figure 27 As shown,

[0169] In the first brightness mode MM1, when the first color light-emitting device displays the minimum grayscale Gmix, the first data voltage written by P1 during the writing phase is PWM-data12, the second data voltage is PAM-data1, and the effective light-emitting duration of P2 during the light-emitting phase is t32. When the first color light-emitting device displays the maximum grayscale Gmax, the first data voltage written by P1 during the writing phase is PWM-data11, the second data voltage is PAM-data1, and the effective light-emitting duration of P2 during the light-emitting phase is t31. Within the same brightness mode, the second data voltage used by the first color light-emitting device is the same when displaying different grayscale levels. That is, the grayscale levels displayed by the light-emitting device PD are controlled according to the grayscale allocation rules.

[0170] In the second brightness mode MM2, when the first color light-emitting device PD displays the minimum grayscale, the first data voltage written during the writing phase is PWM-data22, the second data voltage written is PAM-data2, and the effective light-emitting duration during the light-emitting phase is t42. When the first color light-emitting device displays the maximum grayscale, the first data voltage written during the writing phase P1 is PWM-data21, the second data voltage written is PAM-data2, and the effective light-emitting duration during the light-emitting phase P2 is t41. In the second brightness mode MM2, the grayscale levels displayed by the light-emitting device PD are controlled according to the grayscale allocation rules.

[0171] Since PWM-data22 ≠ PWM-data12, then t42 ≠ t32. Furthermore, t41 - t42 > t31 - t32.

[0172] In the first brightness mode MM1, by adjusting the first data voltage, the effective light-emitting duration of the first color light-emitting device can be varied between t32 and t31, thereby achieving 0-255 grayscale display of the first color light-emitting device. In the second brightness mode MM1, by adjusting the first data voltage, the effective light-emitting duration of the first color light-emitting device can be varied between t42 and t41, thereby achieving 0-255 grayscale display of the first color light-emitting device. Setting t41-t42>t31-t32 makes the adjustable range of the effective light-emitting duration in the second brightness mode MM2 larger, thereby meeting the grayscale distribution requirements at lower brightness levels, making the brightness differences between different grayscale levels more obvious in the second brightness mode MM2, and ensuring the display effect in the second brightness mode MM2.

[0173] In some embodiments, the light-emitting device (PD) includes a second-color light-emitting device, and the second-color light-emitting device emits a different color than the first-color light-emitting device; the driving method includes:

[0174] In the first brightness mode MM1, when the first color light-emitting device performs grayscale display, the second data voltage written by P1 during the writing phase is PAM-data1; when the second color light-emitting device performs grayscale display, the second data voltage written by P1 during the writing phase is PAM-data1.

[0175] In the second brightness mode MM2, when the first color light-emitting device performs grayscale display, the second data voltage written by P1 during the writing phase is PAM-data2; when the second color light-emitting device performs grayscale display, the second data voltage written by P1 during the writing phase is PAM-data2. PAM-data2 = PAM-data1

[0176] The driving method provided in this invention allows different colored light-emitting devices to be driven using the same second data voltage within a single brightness mode. Furthermore, each light-emitting device is driven using the same second data voltage in both the first brightness mode MM1 and the second brightness mode MM2. When driving the display panel from a high brightness mode to a low brightness mode, the current density is minimized, thereby ensuring that the light-emitting devices operate within a high uniformity and high efficiency range. Moreover, providing the same second data voltage to different colored light-emitting devices during display driving simplifies the driving process.

[0177] In other embodiments, the display panel also includes a third brightness mode, wherein when displaying the same grayscale level, the brightness of the display panel in the second brightness mode is greater than its brightness in the third brightness mode. Figure 28 This is a comparison schematic diagram of three brightness modes in an embodiment of the present invention. Figure 28 It shows the first brightness mode MM1, the second brightness mode MM2, and the third brightness mode MM3. Figure 28 The abscissa represents time, and the ordinate represents the instantaneous brightness. It shows the effective emission duration and instantaneous brightness when the first color light-emitting device displays the maximum gray level Gmax in three modes. As Figure 28 shown,

[0178] In the first brightness mode MM1, when the first color light-emitting device displays the maximum gray level Gmax, the first data voltage written in the writing stage P1 is PWM-data11, the second data voltage written is PAM-data1, and the effective emission duration in the emission stage is t31.

[0179] In the second brightness mode MM2, when the first color light-emitting device displays the maximum gray level Gmax, the first data voltage written in the writing stage P1 is PWM-data21, the second data voltage written is PAM-data2, and the effective emission duration of the emission stage P2 is t41.

[0180] In the third brightness mode MM3, when the first color light-emitting device displays the maximum gray level Gmax, the first data voltage written in the writing stage P1 is PWM-data31, the second data voltage written is PAM-data3, so that the effective emission duration of the emission stage P2 is t51. In the third brightness mode MM3, the gray level of the light-emitting device PD is controlled according to the gray level distribution rule, indicating that the first color light-emitting device uses the same second data voltage, that is, PAM-data3, when displaying any gray level in the third brightness mode MM3.

[0181] Among them, PAM-data3 ≠ PAM-data1 = PAM-data2, t41 < t31, t51 ≤ t31. In addition, PWM-data21 ≠ PWM-data11, and when t51 = t31, PWM-data31 ≠ PWM-data11.

[0182] From Figure 28 it can be seen that the instantaneous brightness of the first color light-emitting device when displaying the maximum gray level Gmax in the third brightness mode MM3 is less than its instantaneous brightness when displaying the maximum gray level Gmax in the second brightness mode MM2 / the first brightness mode MM1.

[0183] In the driving method provided by this embodiment, when the first color light-emitting device displays the maximum grayscale level, the second data voltage used in the third brightness mode MM3 is different from the second data voltage used in the second brightness mode MM2. The second data voltage affects the magnitude of the driving current, and thus the current density. When driving the display panel from a high brightness mode to a low brightness mode, the current density is minimized, thereby ensuring that the light-emitting device operates in a high uniformity and high efficiency range. In an even lower brightness mode, the brightness of the display panel is reduced by adjusting the second data voltage to decrease the instantaneous brightness of the light-emitting device.

[0184] The brightness of the first color light-emitting device when displaying the maximum grayscale Gmax in the third brightness mode MM3 is less than its brightness when displaying the maximum grayscale Gmax in the second brightness mode MM2. However, since the second data voltage used by the first color light-emitting device in the third brightness mode MM3 and the second brightness mode MM2 / first brightness mode MM1 are different, the magnitude of the second data voltage and the effective light emission duration will affect the brightness of the light-emitting device. Therefore, setting t51≤t31 ensures that the amplitude range of the first data voltage that the display driver chip can provide (i.e., the range between the maximum and minimum values ​​of the first data voltage that the display driver chip can provide) can be reasonably applied in the third brightness mode MM3.

[0185] In some embodiments, the second driving circuit 20 includes a first transistor, and the output terminal of the first driving circuit 20 is coupled to the gate of the first transistor; the first transistor is a p-type transistor; the first transistor is... Figure 23 The second driving transistor M7 shown in the diagram is, or is Figure 25 The diagram illustrates the light emission duration control transistor M14. The driving method includes:

[0186] PAM-data3 > PAM-data1. That is, the second data voltage written by the light-emitting device during the write phase in the third brightness mode MM3 is greater than the second data voltage written during the write phase in the second brightness mode MM2 / first brightness mode MM1. This adapts to the characteristics of the first transistor in the second driving circuit 20, adjusting the current density of the light-emitting device in the third brightness mode MM3 to meet the display requirements of the low brightness mode.

[0187] In some implementations, the display panel also includes a fourth brightness mode, wherein when displaying the same grayscale level, the brightness of the display panel in the third brightness mode is greater than its brightness in the fourth brightness mode. Figure 29 This is another comparative diagram of the three brightness modes in an embodiment of the present invention. Figure 29 The diagram illustrates the second brightness mode MM2, the third brightness mode MM3, and the fourth brightness mode MM4. Figure 29 The horizontal axis represents time, and the vertical axis represents instantaneous brightness. This illustrates the effective emission duration and instantaneous brightness of the first-color light-emitting device when displaying the maximum grayscale Gmax in three modes. (Example...) Figure 29 As shown,

[0188] In the second brightness mode MM2, when the first color light-emitting device displays the maximum gray level Gmax, the first data voltage written by P1 in the writing stage is PWM-data21, the second data voltage written is PAM-data2, and the effective light emission duration of P2 in the light emission stage is t41.

[0189] In the third brightness mode MM3, when the first color light-emitting device displays the maximum gray level Gmax, the first data voltage written by P1 in the writing stage is PWM-data31, the second data voltage written is PAM-data3, and the effective light-emitting time of P2 in the light-emitting stage is t51.

[0190] In the fourth brightness mode MM4, when the first color light-emitting device displays the maximum grayscale Gmax, the first data voltage written by P1 during the writing phase is PWM-data41, and the second data voltage is PAM-data4, making the effective light-emitting duration of P2 in the light-emitting phase t61. In the fourth brightness mode MM4, the light-emitting device PD displays grayscale levels according to the grayscale allocation rules. Specifically, PAM-data4 ≠ PAM-data3 ≠ PAM-data2, t61 ≤ t51 ≤ t31, t41... <t31。

[0191] Optional, PWM-data31 = PWM-data41, t61 = t51.

[0192] Depend on Figure 29 It can be seen that the instantaneous brightness of the first color light-emitting device when displaying the maximum gray level Gmax in the fourth brightness mode MM4 is less than its instantaneous brightness when displaying the maximum gray level Gmax in the third brightness mode MM3.

[0193] In this embodiment, the fourth brightness mode MM4 is a brightness mode with a lower brightness than the third brightness mode MM3. Based on the third brightness mode MM3, the overall brightness is further reduced by adjusting the second data voltage, thereby decreasing the instantaneous brightness of the light-emitting device and reducing the current density, thus achieving a display mode with even lower brightness.

[0194] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 30 This is a schematic diagram of a display device provided in an embodiment of the present invention, such as... Figure 30As shown, the display device includes a display panel 100, which is driven by the driving method provided in any embodiment of the present invention. The driving method for the display panel has been described in the above embodiments and will not be repeated here. The display device provided in the embodiments of the present invention can be, for example, an electronic device with display function such as a mobile phone, tablet, computer, television, or smart wearable product.

[0195] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A driving method for a display panel, characterized in that, The display panel includes multiple light-emitting devices and multiple pixel circuits. A frame of the display panel includes at least one subframe, and the operation of the pixel circuits in the subframe includes at least a light-emitting phase. The display panel includes a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode. The driving method includes: In the first brightness mode, one frame of the display panel includes N sub-frames, where N is an integer and N≥2; in the first brightness mode, the light-emitting device is controlled to display grayscale levels according to the instantaneous brightness allocation rule of the sub-frames. The subframe instantaneous brightness allocation rule includes: the gray level displayed by the light-emitting device increases as its instantaneous brightness in the subframe increases; the light-emitting device is allocated to emit light in the next subframe after reaching its maximum instantaneous brightness in the current subframe; and the duration of the light-emitting phase in the next subframe is not less than the duration of the light-emitting phase in the current subframe. In the second brightness mode, one frame of the display panel includes M subframes, where M is an integer and N≥M≥1; in the second brightness mode, the light-emitting device is controlled to display grayscale levels according to the instantaneous brightness allocation rule of the subframes. In the first brightness mode, the maximum duration of the light emission phase in the N subframes is t10, which is greater than the maximum duration of the light emission phase in the M subframes in the second brightness mode.

2. The driving method according to claim 1, characterized in that, The driving method includes: In the first brightness mode, the duration of the light emission phase in the Nth subframe sorted by the duration of the light emission phase is t10, and the duration of the light emission phase in the (N-1)th subframe is t11. The second brightness mode includes the first sub-brightness mode; In the first sub-brightness mode, M=N, the duration of the light emission stage in the Mth sub-frame sorted by the duration of the light emission stage is t20, and the duration of the light emission stage in the (M-1)th sub-frame is t21; where t10> t20, t11≥t21.

3. The driving method according to claim 2, characterized in that, t21 <t11=t20。 4. The driving method according to claim 2, characterized in that, t21=t11=t20.

5. The driving method according to claim 2, characterized in that, The driving method includes: N≥3； In the first brightness mode, the duration of the light emission phase in the i-th subframe sorted by the duration of the light emission phase is equal to the duration of the light emission phase in the i-th subframe sorted by the duration of the light emission phase in the first sub-brightness mode, where i is an integer, 1≤i <N-1。 6. The driving method according to claim 1, characterized in that, The display panel includes multiple light-emitting control lines, and the pixel circuit is coupled to the light-emitting control lines; during the light-emitting phase, the light-emitting control lines provide effective pulses; the driving method includes: In the first brightness mode, the maximum effective pulse width of the emission control line providing the signal in N subframes is greater than the maximum effective pulse width of the emission control line providing the signal in M ​​subframes in the second brightness mode.

7. The driving method according to claim 1, wherein: In the first brightness mode, the duration of the light-emitting stage in the Nth sub-frame among the N sub-frames sorted according to the duration of the light-emitting stage is t10. The second brightness mode includes a second sub-brightness mode. In the second sub-brightness mode, 1 < M < N, the duration of the light-emitting stage in the Mth sub-frame among the M sub-frames sorted according to the duration of the light-emitting stage is t22; t10 > t22.

8. The driving method according to claim 7, characterized in that, M = N - 1.

9. The driving method according to claim 7, characterized in that, The driving method includes: In the second sub-brightness mode, the duration of the light-emitting stage in the jth sub-frame sorted according to the duration of the light-emitting stage is equal to the duration of the light-emitting stage in the jth sub-frame sorted according to the duration of the light-emitting stage in the first brightness mode, where j is an integer and 1 ≤ j ≤ M.

10. The driving method according to claim 7, wherein: The second brightness mode includes a third sub-brightness mode. When displaying the same gray-scale level, the brightness of the display panel in the second sub-brightness mode is greater than its brightness in the third sub-brightness mode; the driving method includes: In the third sub-brightness mode, M < N, the duration of the light-emitting stage in the Mth sub-frame among the M sub-frames sorted according to the duration of the light-emitting stage is t23, and t23 < t22.

11. The driving method according to claim 7, wherein: The second brightness mode includes a fourth sub-brightness mode. When displaying the same gray-scale level, the brightness of the display panel in the second sub-brightness mode is greater than its brightness in the fourth sub-brightness mode; the driving method includes: In the second sub-brightness mode, the duration of the light-emitting stage in the first sub-frame among the M sub-frames sorted according to the duration of the light-emitting stage is t12. In the fourth sub-brightness mode, M = 1, the duration of the light-emitting stage in the sub-frame is t24, and t24 ≤ t12.

12. The driving method according to claim 11, wherein: The working process of the pixel circuit in the sub-frame further includes a writing stage. The second brightness mode includes a fifth sub-brightness mode. When displaying the same gray-scale level, the brightness of the display panel in the fourth sub-brightness mode is greater than its brightness in the fifth sub-brightness mode; the driving method includes: In the fourth sub-brightness mode, when the light-emitting device displays the maximum gray scale, the data voltage written in the writing stage in the sub-frame is V1. In the fifth sub-brightness mode, M = 1, the duration of the light-emitting stage in the sub-frame is t25, t25 = t24, and when the light-emitting device displays the maximum gray scale, the data voltage written in the writing stage in the sub-frame is V2, and V2 ≠ V1.

13. The driving method according to claim 7, wherein: The display panel includes multiple light-emitting control lines, and the pixel circuit is coupled to the light-emitting control lines; in the light-emitting stage, the light-emitting control lines provide an effective pulse width; the driving method includes: In the first brightness mode, the starting time interval of the light emission control line providing an effective pulse in two adjacent subframes is ΔtE1; In the second brightness mode, the subframe includes an adjacent first subframe and a second subframe, and the starting time interval of the light emission control line providing an effective pulse in the first subframe and the second subframe is ΔtE2; ΔtE2>ΔtE1.

14. The driving method according to claim 13, characterized in that, The driving method includes: M≥2； In the second brightness mode, the subframe includes an adjacent third subframe and a fourth subframe, and the starting time interval of the effective pulse provided by the light emission control line in the third subframe and the fourth subframe is ΔtE1.

15. The driving method according to claim 13, characterized in that, The driving method includes: In the first brightness mode, the period of the effective pulse provided by the light emission control line is T1; In the second brightness mode, the period of the effective pulse provided by the light emission control line is T2; T2 > T1.

16. The driving method according to claim 15, characterized in that, The display panel also includes multiple scan lines and multiple data lines. The pixel circuit is coupled to the scan lines and the data lines respectively. The operation of the pixel circuit in the sub-frame also includes a writing phase. In the writing phase, the scan lines provide valid pulses and write the data voltage provided by the data lines into the pixel circuit. The driving method includes: In the first brightness mode, the scan line provides an effective pulse with a period of T1; In the second brightness mode, the scan line provides an effective pulse period of T2.

17. The driving method according to claim 13, characterized in that, The display panel also includes multiple scan lines and multiple data lines, and the pixel circuit is coupled to the scan lines and the data lines respectively; the operation of the pixel circuit in the sub-frame also includes a writing stage; in the writing stage, the scan lines provide valid pulses and write the data voltage provided by the data lines into the pixel circuit; The driving method includes: The period of the effective pulse provided by the scan line in the first brightness mode is equal to the period of the effective pulse provided by it in the second brightness mode; In the second brightness mode, between the writing phase of the first subframe and the writing phase of the second subframe, the scan line provides a valid pulse, and the data line writes a dark state voltage or a bias voltage to the pixel circuit.

18. The driving method according to claim 1, characterized in that, The driving method includes: In the first brightness mode, the duration of the light emission phase of the N subframes displayed in chronological order gradually increases or gradually decreases; And / or, in the second brightness mode, M≥2, the duration of the light emission phase of the M subframes displayed in chronological order gradually increases or gradually decreases.

19. The driving method according to claim 1, characterized in that, The driving method includes: One of the subframes includes a gamma curve; In the first brightness mode, the N subframes correspond to N first gamma curves. The nth subframe displayed in chronological order among the N subframes includes the nth first gamma curve, where n is an integer, 1≤n≤N. When the light-emitting device is displayed in the nth subframe, it converts grayscale information into data voltage according to the nth first gamma curve. In the second brightness mode, the M subframes correspond to M second gamma curves. The mth subframe displayed in chronological order among the M subframes includes the mth second gamma curve, where m is an integer and 1 ≤ m ≤ M. When the light-emitting device displays the mth subframe, it converts grayscale information into data voltage according to the mth second gamma curve.

20. A driving method for a display panel, characterized in that, The display panel includes multiple light-emitting devices and multiple pixel circuits; the pixel circuit includes a first driving circuit and a second driving circuit, the first driving circuit being configured to control the duration of providing driving current to the light-emitting devices based on a first data voltage, and the second driving circuit being configured to control the amplitude of providing driving current to the light-emitting devices based on a second data voltage; The operation of the pixel circuit in one frame of the display panel includes a writing phase and a light-emitting phase; The display panel includes a first brightness mode and a second brightness mode. When displaying the same grayscale level, the brightness of the display panel in the first brightness mode is greater than its brightness in the second brightness mode; the light-emitting device includes a first color light-emitting device; the driving method includes: In the first brightness mode, when the first color light-emitting device displays the maximum grayscale, the first data voltage written in the writing phase is PWM-data11, the second data voltage written is PAM-data1, and the effective light-emitting duration of the light-emitting phase is t31; in the first brightness mode, the light-emitting device is controlled to display grayscale levels according to grayscale allocation rules; the grayscale allocation rules include: the second data voltage written in the writing phase is fixed, and the grayscale level displayed by the light-emitting device changes with the change of the first data voltage; In the second brightness mode, when the first color light-emitting device displays the maximum grayscale, the first data voltage written in the writing phase is PWM-data21, the second data voltage written is PAM-data2, and the effective light-emitting duration of the light-emitting phase is t41; in the second brightness mode, the light-emitting device is controlled to display grayscale levels according to the grayscale allocation rule. Where PWM-data21 ≠ PWM-data11, PAM-data2 = PAM-data1, t41 <t31。 21. The driving method according to claim 20, characterized in that, The driving method includes: In the first brightness mode, when the first color light-emitting device displays the minimum gray level, the first data voltage written in the writing stage is PWM-data12, the second data voltage written is PAM-data1, and the effective light-emitting duration of the light-emitting stage is t32. In the second brightness mode, when the first color light-emitting device displays the minimum gray level, the first data voltage written in the writing stage is PWM-data22, the second data voltage written is PAM-data2, and the effective light-emitting duration of the light-emitting stage is t42. In this case, PWM-data22 ≠ PWM-data12, and t41 - t42 > t31 - t32.

22. The driving method according to claim 20, characterized in that, The light-emitting device includes a second-color light-emitting device, and the second-color light-emitting device and the first-color light-emitting device emit different colors; the driving method includes: In the first brightness mode, when the second color light-emitting device performs grayscale display, the second data voltage written in the writing stage is PAM-data1; In the second brightness mode, when the second color light-emitting device performs grayscale display, the second data voltage written in the writing stage is PAM-data2.

23. The driving method according to claim 20, characterized in that, The display panel further includes a third brightness mode, wherein when displaying the same grayscale level, the brightness of the display panel in the second brightness mode is greater than its brightness in the third brightness mode; the driving method includes: In the third brightness mode, when the first color light-emitting device displays the maximum grayscale, the first data voltage written in the writing stage is PWM-data31, the second data voltage written is PAM-data3, and the effective light-emitting duration of the light-emitting stage is t51; in the third brightness mode, the light-emitting device is controlled to display grayscale levels according to the grayscale allocation rule. Where PAM-data3≠PAM-data1, t51≤t31.

24. The driving method according to claim 23, characterized in that, The second driving circuit includes a first transistor, and the output terminal of the first driving circuit is coupled to the gate of the first transistor; the first transistor is a p-type transistor; the driving method includes: PAM-data3>PAM-data1.

25. The driving method according to claim 23, characterized in that, The display panel further includes a fourth brightness mode, wherein when displaying the same grayscale level, the brightness of the display panel in the third brightness mode is greater than its brightness in the fourth brightness mode; the driving method includes: In the fourth brightness mode, when the first color light-emitting device displays the maximum grayscale, the first data voltage written in the writing stage is PWM-data41, the second data voltage written is PAM-data4, and the effective light-emitting duration of the light-emitting stage is t61; in the fourth brightness mode, the light-emitting device is controlled to display grayscale levels according to the grayscale allocation rule. Where PAM-data4≠PAM-data3, t61≤t51.

26. A driving method for a display panel, characterized in that, The display panel includes multiple light-emitting devices and multiple pixel circuits. A frame of the display panel includes at least one subframe. The operation process of the pixel circuit in the subframe includes at least a writing phase and a light-emitting phase. The display panel includes a first mode, and the driving method includes: In the first mode, the subframe includes a fifth subframe and a sixth subframe; When the light-emitting device displays the first gray-scale level: in the fifth sub-frame, the duration of the light-emitting stage is t1, and the data voltage of the writing stage corresponding to the fifth sub-frame is V3; in the sixth sub-frame, the duration of the light-emitting stage is t2, and the data voltage of the writing stage corresponding to the sixth sub-frame is V4; and t1 ≤ t2; where ││V4│ - │V3││ ≤ 0.2△V, and △V is the voltage difference between the maximum value and the minimum value of the data voltage provided by the display panel; Alternatively, the driving transistor in the pixel circuit is an n-type transistor and V3 > V4, or the driving transistor in the pixel circuit is a p-type transistor and V3 < V4.

27. The driving method according to claim 26, wherein The first mode includes a first sub-mode and a second sub-mode. When displaying the same gray-scale level, the brightness of the display panel in the first sub-mode is greater than its brightness in the second sub-mode; In the first sub-mode, one frame of the display panel includes N sub-frames, N is an integer, N ≥ 2, and the N sub-frames include the fifth sub-frame and the sixth sub-frame; In the second sub-mode, one frame of the display panel includes M sub-frames, M is an integer, N ≥ M ≥ 2, and the M sub-frames include the fifth sub-frame and the sixth sub-frame; Wherein, in the N sub-frames in the first sub-mode, the maximum duration of the light-emitting stage is t70, and in the M sub-frames in the second sub-mode, the maximum duration of the light-emitting stage is t80, and t70 > t80.

28. The driving method according to claim 27, wherein In the first sub-mode, in the Nth sub-frame among the N sub-frames sorted by the duration of the light-emitting stage, the duration of the light-emitting stage is t70, and in the (N - 1)th sub-frame, the duration of the light-emitting stage is t71; In the second sub-mode, M = N. In the Mth sub-frame among the M sub-frames sorted by the duration of the light-emitting stage, the duration of the light-emitting stage is t80, and in the (M - 1)th sub-frame, the duration of the light-emitting stage is t81; where t81 ≤ t71 ≤ t80.

29. The driving method according to claim 27, wherein In the first sub-mode, in the Nth sub-frame among the N sub-frames sorted by the duration of the light-emitting stage, the duration of the light-emitting stage is t70, and in the (N - 1)th sub-frame, the duration of the light-emitting stage is t71; In the second sub-mode, M < N. In the Mth sub-frame among the M sub-frames sorted by the duration of the light-emitting stage, the duration of the light-emitting stage is t80, and t80 ≤ t71.

30. The driving method according to claim 29, wherein In the first sub-mode, when the light-emitting device displays the first gray-scale level, the data voltage of the writing stage corresponding to the fifth sub-frame is V31; In the second sub-mode, when the light-emitting device displays the first grayscale level, the data voltage of the writing stage corresponding to the fifth sub-frame is V32; Where, ||V31|-||V32||≤0.2△V.

31. The driving method according to claim 27, characterized in that, In the first sub-mode, the duration of the light emission phase in the first sub-frame among the N sub-frames sorted by the duration of the light emission phase is t72; The display panel also includes a second mode, wherein when displaying the same grayscale level, the brightness of the display panel in the first sub-mode is greater than its brightness in the second mode; In the second mode, one frame of the display panel includes one subframe, the duration of the light-emitting phase in the subframe is t91, and the data voltage corresponding to the light-emitting device displaying the maximum gray level is V5; Where t91≤t72,││V5│-│V3││≤0.2△V, and / or,││V5│-│V4││≤0.2△V.

32. A display device, characterized in that, It includes a display panel, which is driven by the driving method according to any one of claims 1 to 31.

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